Consider one view outside the George Washington University Hospital in Washington DC.

“I think we need to paint a mural to Luigi, what do you think?” said one passer-by, with a smile.

“I don’t endorse murder but I think it’s a good thing if CEOs are a little bit nervous.”

Everyone has a thought for the alleged assassin, Luigi Mangione, and it’s not all negative.

Villain or hero? It’s a question dividing America, and not necessarily down the middle.

A quick trawl through the internet reveals Luigi merchandise, Luigi tattoos, “Free Luigi” posters and a fundraiser for Luigi’s legal defence – which has raised $157,225 (£125,492).

Part of the murder response is all about Luigi – the part that bypasses due sympathy for the family and friends of Brian Thompson, the 50-year-old father-of-two gunned down in the street.

He was charged with first-degree murder – later modified to murder as an act of terrorism – after a manhunt that lasted five days.

If the motive was anger with the US health insurance industry, then it’s a sentiment shared.

Americans have long been ground down by the cost of private insurance to gain access to healthcare and the struggle that many face to secure payments.

Claims denied by insurance companies are typically made by people in their darkest hour of urgent medical need. Stories of emotional and financial trauma are legion.

Not that any of that justifies the murder of a healthcare executive on a New York street. Or does it?

I put that question to Sam Beard, organiser of the December 4th legal committee which is raising funds for Luigi Mangione’s legal defence.

He said this: “As a moral matter, it’s a difficult thing to tease out because the same logic has to apply both ways.

“A CEO had his life, tragically and surprisingly to all of his loved ones, cut short, but he was considered an effective CEO exactly because he profited from denying peoples’ claims which cut their lives short.”

“From a simple moral rule, we can’t just apply it without acknowledging that we’re in an immoral system that degrades the value of some human lives while uplifting the value of others. So when we treat this only as a moral act we are plugging our ears to its larger political meaning.

“I’m not in favour of anybody having their life tragically cut short but what I do see as undeniable is that this privatised healthcare system that does cut the lives short of hundreds of thousands of Americans every few years, may be finally getting its reckoning.”

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The adulation attracted by Mangione troubles the authorities in New York, who fear copycat attacks.

Business executives and employees in health insurance have reported being threatened and harassed. “Wanted” posters have also been put up around New York, featuring the CEOs of at least two health insurance companies.

When the indictment against Mangione was unveiled earlier this week, New York City’s Police Commissioner Jessica Tisch emphatically denounced the adulation he has enjoyed.

“This was a senseless act of violence,” she said. “We don’t celebrate murders and we don’t lionise the killing of anyone.”

There’s no doubting the anger felt at the reaction in his favour – but there’s no denying it either.

The post may be seen as glittering and the man as controversial and divisive but beyond those truths, the role of British ambassador to Washington is pivotal and relationship-defining.

That is particularly the case right now: to navigate the “special relationship” through Donald Trump‘s second presidency.

And so this is not a decision that would have been taken without serious consideration despite the baggage some may see Lord Mandelson as carrying.

It follows months of speculation over who could get the job.

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Back last summer, before Trump won the election, a candidate had already been identified by former prime minister Rishi Sunak. He’d given the nod to his national security advisor Sir Tim Barrow, a former ambassador to Russia and the EU.

But then Sunak lost the election. He was out along with his pick. One of diplomacy’s best jobs and Washington’s finest buildings was almost to be Barrow’s, but not quite. What a blow.

Trump’s victory focused minds. It required a particular candidate and doubtless a particular type of character – not necessarily the same type as would have been chosen to navigate a Harris administration.

Lord Mandelson is a political shapeshifter. He is a sharp and agile operator. He is decisive and direct. But he also understands the sensitivities of navigating Trump’s unpredictable and transactional style.

All those traits could be applied to the person Lord Mandelson will take over from.

Dame Karen Pierce became ambassador in 2020 towards the end of Trump’s first term.

A career diplomat, she moved into the role after the previous ambassador, Sir Kim Darroch, was effectively kicked out of America by Trump after a series of less-than-complementary diplomatic cables were leaked.

Dame Karen and her team rebuilt the relationship with Trump’s team and then fostered good terms with the Biden administration with close work on issues like Ukraine.

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And under her leadership the embassy has forged close ties with the incoming Trump administration.

Some view Trump’s presidency as an existential challenge for global diplomacy. Pierce does not see him in quite those terms and nor does Peter Mandelson.

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While an extension of her term was an option for Sir Keir Starmer, sources tell me that it seems more sensible to build on the work she has done with a new ambassador who can get to know the incoming White House team from day one.

His trade background will be seen as vital. It’s a background Pierce doesn’t have. Carving out some sort of trade deal with America at a time when Trump is promising stinging tariffs will be a challenge.

Where Mandelson may fall short is foreign and military policy. In a particularly unstable world, US-UK foreign policy alignment is vital. Mandelson’s experience here does not compare to that of Karen Pierce.

Hours after the Lord Mandelson announcement, embassy staff gathered for their Christmas party in the ambassador’s residence.

No Ferrero Rocher but certainly a nostalgic vibe. Pierce has been diplomatically very effective and is very popular among staff.

President Joe Biden has set fresh climate targets for the United States before climate sceptic Donald Trump takes office in January.

Today the outgoing president has unveiled a new goal to slash US emissions of greenhouse gases by 61% from 2005 levels by 2035.

The 10-year plan should generate “more good-paying jobs, more affordable energy, cleaner air, cleaner water, healthier environments for everyone”, President Biden said.

“I’m proud that my administration is carrying out the boldest climate agenda in American history,” he added, citing his Inflation Reduction Act that poured hundreds of billions of dollars into green industries.

In reality, Donald Trump is expected to undo many green policies intended to tackle climate change when he takes office on 20 January.

But virtually every country in the world is bound by the Paris climate agreement (Mr Trump pulled the US out of the deal in his first term) to publish a new 2035 climate goal by February next year, along with a plan to reach it, known as an NDC (nationally determined contribution).

Most countries – apart from a handful including the UK – are yet to publish their NDCs.

The Biden administration was keen to drive through the US plan before Mr Trump takes office.

President-elect Trump questions well-established climate science and has previously called climate change a “hoax”, though he was less vocal about it this year.

He is expected to ignore climate goals and again pull the US out of the landmark Paris treaty, which President Biden ensured the US rejoined at the start of his term.

New target intended as a ‘North Star’

The new target is not legally binding, but President Biden’s team said it would guide states, businesses and organisations continuing with climate action during Mr Trump’s second term.

US climate envoy John Podesta said: “American climate leadership is determined by so much more than whoever sits in the Oval Office”.

He pointed to the fact that during the last Trump presidency, governments, businesses and investors formed the America Is Still In coalition to continue with climate action. Today the group has 5,000 members.

New York governor Kathy Hochul, a Democrat, said the new goal would “serve as our North Star, guiding us in the years to come and keeping America on track toward a cleaner, safer future”.

However, Gautam Jain, from the Centre for Global Energy Policy at Columbia University, said without new incentives, he was “not sure how much the target would change” among businesses and investors.

Especially as even the current incentives under the Biden administration’s Inflation Reduction Act haven’t been enough to put the US on course to reach its interim 2030 target, he said, while action at state level would have carried on regardless.

But although there “may be no immediate impact”, the target would “lay the groundwork” for the next president in 2029 to quickly resume climate action, he added.

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How has Donald Trump responded?

Karoline Leavitt, a Donald Trump spokeswoman who will become the youngest-ever White House press secretary when he takes office, declined to comment on the target.

But she said during his previous 2016-2020 term, he produced “affordable, reliable energy for consumers along with stable, high-paying jobs for small businesses – all while dropping US carbon emissions to their lowest level in 25 years”.

While emissions did fall during Mr Trump’s first term, the rate of the fall slowed down, and part of the drop was attributed to a recession.

In his second term, Mr Trump will “once again deliver clean air and water for American families while Making America Wealthy Again”, Ms Leavitt added.

US climate action has global ramifications

President Biden’s new plan covers all greenhouse gases from across the US economy, and puts the country on track to reach net zero emissions by 2050, the White House said.

The course the US charts on climate action will have global ramifications. It is the largest historical emitter and second-largest current emitter.

And as it is the world’s richest country, other countries look to it to either set the bar high for others to aim for, or provide cover for them to sit back.

Debbie Weyl, acting US director at the World Resources Institute, said: “The 2035 emissions reduction target is at the lower bound of what the science demands, and yet it is close to the upper bound of what is realistic if nearly every available policy lever were pulled.

“Assertive action by states and cities will be essential to achieving this goal.”

At the COP29 climate summit, the UK Prime Minister Keir Starmer unveiled the UK’s new climate goal to slash emissions by 81% by 2035.