The story Donald Trump tells about himselfand to himselfhas always been one of domination. It runs through the canonical texts of his personal mythology. In The Art of the Deal, he filled page after page with examples of his hard-nosed negotiating tactics. On The Apprentice, he lorded over a boardroom full of supplicants competing for his approval. And at his campaign rallies, he routinely regales crowds with tales of strong-arming various world leaders in the Oval Office.

This image of Trump has always been dubious. Those boardroom scenes were, after all, reality-TV contrivances; those stories in his book were, by his own ghostwriters account, exaggerated in many cases to make Trump appear savvier than he was. And theres been ample reporting to suggest that many of the world leaders with whom Trump interacted as president saw him more as an easily manipulated mark than as a domineering statesman to be feared.

The truth is that Trump, for all of his tough-guy posturing, spent most of his career failing to push people around and bend them to his will.

That is, until he started dealing with Republican politicians.

For nearly a decade now, Trump has demonstrated a remarkable ability to make congressional Republicans do what he wants. He threatens them. He bullies them. He extracts from them theatrical displays of devotionand if they cross him, he makes them pay. If there is one arena of American power in which Trump has been able to actually be the merciless alpha he played on TVand there may, indeed, be only oneit is Republican politics. His influence was on full display this week, when he derailed a bipartisan border-security bill reportedly because he wants to campaign on the immigration crisis this year.

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Sam Nunberg, a former adviser to Trump, has observed this dynamic with some amusement. Its funny, he told me in a recent phone interview. In the business world and in the entertainment world, I dont think Donald was able to intimidate people as much.

He pointed to Trumps salary negotiations with NBC during Trumps Apprentice years. Jeff Zucker, who ran the network at the time, has said that Trump once came to him demanding a raise. At the time, Trump was making $40,000 an episode, but he wanted to make as much as the entire cast of Friends combined: $6 million an episode. Zucker countered with $60,000. When Trump balked, Zucker said hed find someone else to host the show. The next day, according to Zucker, Trumps lawyer called to accept the $60,000. (A spokesperson for the Trump campaign did not respond to a request for comment.)

Contrast that with the power Trump wields on Capitol Hillhow he can kill a bill or tank a speakership bid with a single post on social media; how high-ranking congressmen are so desperate for his approval that theyll task staffers to sort through packs of Starbursts and pick out just the pinks and reds so Trump can be presented with his favorite flavors.

I just remember that thered be a lot of stuff that didnt go his way, Nunberg told me, referring to Trumps business career. But he has all these senators in the fetal position! They do whatever he wants.

Why exactly congressional Republicans have proved so much more pliable than anyone else Trump has contended with is a matter of interpretation. One explanation is that Trump has simply achieved much more success in politics than he ever did, relatively speaking, in New York City real estate or on network TV. For all of his tabloid omnipresence, Trump never had anything like the presidential bully pulpit.

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It stands to reason that [when] the president and leader of your party is pushing for something thats whats going to happen, a former chief of staff to a Republican senator, who requested anonymity in order to candidly describe former colleagues thinking, told me. Take away the office and put him back in a business setting, where facts and core principles matter, and it doesnt surprise me that it wasnt as easy.

But, of course, Trump is not the president anymoreand there is also something unique about the sway he continues to have over Republicans on Capitol Hill. In his previous life, Trump had viewers, readers, fansbut he never commanded a movement that could end the careers of the people on the other side of the negotiating table.

And Trumpwhose animal instinct for weakness is one of his defining traitsseemed to intuit something early on about the psychology of the Republicans he would one day reign over.

Nunberg told me about a speech he drafted for Trump in 2015 that included this line about the Republican establishment: Theyre good at keeping their jobs, not their promises. When Trump read it, he chuckled. Its so true, he said, according to Nunberg. Thats all they care about. (Nunberg was eventually fired from Trumps 2016 campaign.)

This ethos of job preservation at all costs is not a strictly partisan phenomenon in Washingtonnor is it new. As I reported in my recent biography of Mitt Romney, the Utah senator was surprised, when he arrived in Congress, by the enormous psychic currency his colleagues attached to their positions. One senator told Romney that his first consideration when voting on any bill should be Will this help me win reelection?

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But the Republican Party of 2015 was uniquely vulnerable to a hostile takeover by someone like Trump. Riven by years of infighting and ideological incoherence, and plagued by a growing misalignment between its base and its political class, the GOP was effectively one big institutional power vacuum. The litmus tests kept changing. The formula for getting reelected was obsolete. Republicans with solidly conservative records, such as House Majority Leader Eric Cantor, were getting taken out in primaries by obscure Tea Party upstarts.

To many elected Republicans, it probably felt like an answer to their prayers when a strongman finally parachuted in and started telling them what to do. Maybe his orders were reckless and contradictory. But as long as you did your best to look like you were obeying, you could expect to keep winning your primaries.

As for Trump, its easy to see the ongoing appeal of this arrangement. The Apprentice was canceled long ago, and the Manhattan-real-estate war stories have worn thin. Republicans in Congress might be the only ostensibly powerful people in America who will allow him to boss them around, humiliate them, and assert unbridled dominance over them. Theyve made the myth true. How could he possibly walk away now?