Democratic representative Matt Cartwright, who was among those meeting Mr Zelenskyy at the Scranton Army Ammunition Plant, said that the Ukrainian leader had a simple message: “Thank you. And we need more.”
Mr Zelenskyy faces a busy week in the US as he works to shore up support for Ukraine’s fight against Russia.
He is due to speak at the UN General Assembly annual gathering in New York on Tuesday and Wednesday, and travel to Washington on Thursday for talks with President Joe Biden and vice president Kamala Harris.
Recent weeks have seen Mr Zelenskyy pushing the US, and other Western allies, for permission to use longer-range missile systems to strike deeper into Russia.
So far the Pentagon and White House have not green-lit the loosening of restrictions. There has been hesitation due to the possibility of a US-made missile hitting Moscow, which could escalate the war.
Mr Zelenskyy will also present his “victory plan” to the US – of which the long-range weapons systems are said to be key.
But his trip comes at a key juncture for his country, as a victory for Donald Trump in the 5 November US presidential elections could prompt a reset of Washington’s policy on Ukraine.
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During a TV debate earlier this month, Mr Trump refused to say if he wanted Ukraine to defeat Russia and said he would try to end the war before taking office if he wins.
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The area around the plant was sealed off ahead of Mr Zelenskyy’s trip on Sunday, with rubbish trucks positioned as roadblocks and a heavy police presence visible.
As Mr Zelenskyy’s motorcade entered the ammunition plant, a small contingent of supporters waved Ukrainian flags nearby.
“It’s unfortunate that we need a plant like this, but it’s here, and it’s here to protect the world,” said Vera Kowal Krewson, a first-generation Ukrainian American who was among the small crowd. “And I strongly feel that way.”
Laryssa Salak, 60, whose parents also immigrated from Ukraine, said she was pleased Mr Zelenskyy came to thank the workers.
But she said it upset her that funding for Ukraine’s defence against Russia divided Americans, and that even some of her friends opposed the support, saying the money should instead go to help Americans.
“But they don’t understand that that money does not directly go to Ukraine,” Ms Salak said. “It goes to American factories that manufacture, like here, like the ammunition. So that money goes to American workers as well. And a lot of people don’t understand that.”
At one point in the war, Ukraine was firing between 6,000-8,000 155mm shells per day.
The rate started to deplete US stockpiles, prompting concern.
In response, the US invested in restarting production lines and now manufactures more than 40,000 155mm shells a month – with plans to hit 100,000 a month.
Donald Trump has pledged for years to surround himself with ultra-loyalists who can mould his government to his vision without barriers.
That’s precisely why he picked Matt Gaetz. Now he’s out, Pam Bondi is in and she’s equally loyal.
Gaetz was uniquely unpopular on Capitol Hill but ultra-MAGA and ultra-loyal to the president-elect.
He was chosen by the president-elect to do his bidding inside the Justice Department as attorney general.
Critics called his pick “a red alert moment for democracy” and the man a “gonzo agent of chaos” – language that would surely only affirm Trump’s decision in his own proudly disruptive mind.
If it wasn’t for the fact that the president-elect is himself a convicted felon, and a man found liable in a civil court of his own sexual offences, the prospect of Gaetz, with all his baggage, making it through the nomination process would have seemed remote.
But Donald Trump’s return to the White House suggested anything is possible.
And so, beyond his loyalty, Gaetz was Trump’s test for his foot soldiers on Capitol Hill. How loyal were they? Would they wave through anyone he appointed?
It turns out that Gaetz, and the storm around his private life, was too much for a proportion of them.
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At least five Senate Republicans were flatly against Matt Gaetz’s confirmation. We understand that they communicated to other senators and those close to Trump that they were unlikely to be swayed.
They included the Republican old guard like Senator Mitch McConnell.
Beyond the hard “no” senators, there were between 20 and 30 other Republicans who were very uncomfortable about having to vote for Gaetz on the Senate floor.
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2:23
Trump pick Matt Gaetz withdraws
The key question is whether Gaetz was Trump’s intentional wild card crazy choice that he knew, deep down, would probably never fly.
Was Gaetz the candidate he had accepted would be vetoed by senators – who would then feel compelled to wave the rest of his nominees through?
Will Pete Hegseth’s alleged sexual impropriety concern them as they consider the suitability of the former Fox News host and army major to run the Department of Defence?
What about Tulsi Gabbard, the candidate Russian state TV calls ‘our girl’, and the appropriateness of her running America’s intelligence agencies?
These are all appointments that the politicians on Capitol Hill must consider and confirm in the weeks ahead.
We don’t yet know who Trump will choose to direct the FBI.
There are some names being floated which will make the establishment of Washington shudder but then that’s precisely why Trump was elected. He is the disrupter. He said so at every rally, on repeat.
He was quick to pivot to another name to replace Gaetz.
Bondi is the former attorney general of Florida. Professionally she is in a different league to Gaetz. She’s been a tough prosecutor, with a no-nonsense reputation.
She is also among the most loyal of loyalists. Her attachment to Trump stretches way back.
I first came across her in Philadelphia in November 2020 when she was among Trump surrogates claiming the election back then had been stolen from them by Joe Bidenand the Democrats.
She was a key proponent of the false claims the election had been rigged and Trump was the rightful winner.
The court cases concluding that was all nonsense didn’t seem to convince her.
Now she is poised to head up the Department of Justice as the country’s top law enforcement official.
Within hours of taking office, president-elect Donald Trump plans to begin rolling out policies including large-scale deportations, according to his transition team.
Sky News partner network NBC News has spoken with more than half a dozen people familiar with the executive orders that his team plans to enact.
One campaign official said changes are expected at a pace that is “like nothing you’ve seen in history”, to signal a dramatic break from President Joe Biden’s administration.
Mr Trump is preparing on day one to overturn specific policies put in place by Mr Biden. Among the measures, reported by sources close to the transition team, are:
• The speedy and large-scale deportations of illegal immigrants
• Ending travel reimbursement for military members seeking abortion care
• Restricting transgender service members’ access to gender-affirming care
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But much of the first day is likely to focus on stopping illegal immigration – the centrepiece of Trump’s candidacy. He is expected to sign up to five executive orders aimed at dealing with that issue alone after he is sworn in on 20 January.
“There will without question be a lot of movement quickly, likely day one, on the immigration front,” a top Trump ally said.
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“There will be a push to make a huge early show and assert himself to show his campaign promises were not hollow.”
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2:23
Donald Trump ally Matt Gaetz has withdrawn his name from consideration to be the next US attorney general.
But Mr Trump’s campaign pledges also could be difficult to implement.
Deporting people on the scale he wants will be a logistical challenge that could take years. Questions also remain about promised tax cuts.
Meanwhile, his pledge to end the war between Russia and Ukraine in just 24 hours would be near impossible.
Even so, advisers based at Mr Trump’s Mar-a-Lago resort or at nearby offices in West Palm Beach, Florida, are reportedly strategising about ending the wars in Ukraine and the Middle East.
Following his decisive victory on 5 November, the president-elect has moved swiftly to build a cabinet and senior White House team.
As of Thursday, he had selected more than 30 people for senior positions in his administration, compared with just three at a similar point in his 2016 transition.
Stephen Moore, a senior economic adviser in Mr Trump’s campaign, told NBC News: “The thing to realise is Trump is no dummy.
“He knows he’s got two to three years at most to get anything done. And then he becomes a lame duck and we start talking about [the presidential election in] 2028.”
Donald Trump ally Matt Gaetz has withdrawn his name from consideration to be the next US attorney general.
Mr Gaetz, a controversial pick to be the country’s top legal official, said his selection was “unfairly becoming a distraction” to the transition of Mr Trump’s administration into the White House.
The Florida Republican had faced significant scrutiny over a federal investigation into sex trafficking allegations involving a 17-year-old girl.
He said in a post on the X social media platform: “There is no time to waste on a needlessly protracted Washington scuffle, thus I’ll be withdrawing my name from consideration to serve as attorney general. Trump’s DOJ (Department of Justice) must be in place and ready on Day 1.
“I remain fully committed to seeing that Donald Trump is the most successful president in history. I will forever be honoured that President Trump nominated me to lead the Department of Justice and I’m certain he will Save America.”
Mr Trump said in a post on his own social media site, Truth Social, that Mr Gaetz had a “wonderful future”.
“I greatly appreciate the recent efforts of Matt Gaetz in seeking approval to be Attorney General,” he wrote.
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“He was doing very well but, at the same time, did not want to be a distraction for the administration, for which he has much respect.”
Mr Gaetz previously faced a nearly three-year Justice Department investigation into sex trafficking allegations involving a 17-year-old girl, which ended in February 2023 without him facing any criminal charges.
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He has always denied the allegations.
He has also been under scrutiny by the House Ethics Committee over wider allegations including sexual misconduct, illicit drug use and accepting improper gifts.
The inquiry was dropped on Wednesday 13 November when Mr Gaetz left Congress – the only forum where the committee has jurisdiction.
The Senate ethics committee is deadlocked on whether their report can be released.
Mr Gaetz’s withdrawal is a blow to Mr Trump’s push to install steadfast loyalists in his incoming administration and the first sign that he could face resistance from members of his own party.