ORLANDO, Fla. — After days of insisting they may paper over their intraparty divisions, Republican lawmakers had been met with a grim reminder of the problem forward on Sunday when former President Donald J. Trump stood earlier than a conservative convention and ominously listed the names of Republicans he’s focusing on for defeat.

As Democrats pursue a liberal agenda in Washington, the previous president’s grievances over the 2020 election proceed to animate a lot of his get together, greater than a month after he left workplace and almost 4 months since he misplaced the election. Many G.O.P. leaders and activists are extra targeted on litigating false claims about voting fraud in final 12 months’s marketing campaign, assailing the expertise firms that deplatformed Mr. Trump and punishing lawmakers who broke with him over his determined bid to retain energy.

In an deal with on Sunday on the Conservative Political Motion Convention in Orlando, his first public look since he left the White Home, Mr. Trump learn a kind of hit checklist of each congressional Republican who voted to question him, all however vowing revenge.

“The RINOs that we’re surrounded with will destroy the Republican Occasion and the American employee and can destroy our nation itself,” he stated, a reference to the phrase “Republicans In Identify Solely,” including that he can be “actively working to elect sturdy, powerful and good Republican leaders.”

Mr. Trump took particular care to single out Consultant Liz Cheney, the third-ranking Home Republican, and Senator Mitch McConnell, the minority chief. He referred to as Ms. Cheney “a warmonger” and stated her “ballot numbers have dropped quicker than any human being I’ve ever seen.” Then he falsely claimed he had helped revive Mr. McConnell’s marketing campaign final 12 months in Kentucky.

Ms. Cheney and Mr. McConnell have harshly criticized Mr. Trump over his position in inciting the Capitol riot on Jan. 6, and Ms. Cheney has repeatedly stated that the G.O.P. ought to minimize ties with the previous president.

Together with his refusal to concede defeat and his dedication to isolate G.O.P. leaders who criticize him, the previous president has successfully denied Republicans from partaking within the kind of reckoning that events historically undertake after they lose energy.

Even with Democrats controlling Congress and the White Home for the primary time in over a decade, lots of the Republicans who spoke on the convention right here stated strikingly little about President Biden or the almost $2 trillion stimulus measure the House passed early Saturday, which congressional Republicans uniformly opposed.

Mr. Trump was the exception, repeatedly taking purpose on the Biden administration. “In only one quick month, now we have gone from America first to America final,” he stated, criticizing the brand new president on points starting from immigration to the Iran nuclear deal. “All of us knew that the Biden administration was going to be unhealthy, however none of us even imagined simply how unhealthy they might be and the way far left they might go.”

But at the same time as he dutifully learn his scripted assaults on his successor, the previous president drew louder applause for pledging to purge his Republican antagonists from the get together.

“Eliminate all of them,” he stated.

Mr. Trump’s assault, and the enthusiastic response to his name for vengeance, illustrated the dilemma Republicans discover themselves in.

Mr. Biden does little to energise conservative activists. Certainly, Mr. Trump and different audio system on the occasion drew extra applause for his or her criticism of Dr. Anthony S. Fauci, Mr. Biden’s chief public well being adviser for the virus and a determine of enmity on the far proper, than for his or her assaults on the president.

Extra consequentially for Republicans, the attention-craving Mr. Trump, denied his social media weaponry, is aware of he can reliably energize the G.O.P. rank-and-file and draw publicity by excoriating his intraparty critics.

The eye surrounding Mr. Trump and his potential plans for the long run are forestalling a targeted assault on Mr. Biden and the Democratic-controlled Congress.

Senator Ted Cruz of Texas, who used his speech on Friday to hail Mr. Trump’s management of the get together, stated in a quick interview that his get together’s voters would pivot to the current as soon as Mr. Biden’s agenda grew to become extra clear.

“Because the American folks see the unhealthy concepts that destroy jobs and strip away our liberties, there’s a pure pendulum to politics,” Mr. Cruz stated, predicting that Republican activists would “completely” pay extra consideration to the present administration later this 12 months.

Mr. Trump made a particular pitch for folks to donate to 2 committees related to him, a notable transfer on condition that he has been the Republican Nationwide Committee’s greatest draw for the final 4 years. He gave an specific description of “Trumpism” as a political ideology targeted on geopolitical deal-making and immigration restrictions, and painted the Republicans who voted for impeachment as determined outliers in an in any other case united get together.

In some methods, the previous president’s re-emergence at CPAC represented a full-circle second. He first examined the fitting’s political waters in 2011 when he appeared on the convention and used his speech to belittle different Republicans and denounce China as a rising energy.

To the delight of the get together’s present lawmakers, nevertheless, Mr. Trump introduced on Sunday that he wouldn’t create a breakaway right-wing get together. “We’re not beginning new events,” he stated of an concept he was privately musing about simply final month. Much less satisfying to many Republican leaders, at the very least these prepared to maneuver on, was the previous president’s musing a few potential run in 2024. “Who is aware of, I could even determine to beat them for a 3rd time,” he stated, bringing attendees to their ft.

Mr. Trump, after all, misplaced the election final 12 months.

However that didn’t cease him from repeatedly, and falsely, claiming in his speech that he had received. After largely sticking to his ready textual content for the primary hour of his 90-minute speech — and itemizing what he stated had been the accomplishments of his tenure — the previous president grew animated and indignant as he veered off the teleprompter to vent about his loss.

“The Supreme Courtroom didn’t have the center or the braveness to do something about it,” Mr. Trump stated of a physique that features three of his appointees. He was met with chants of “You received, you received!”

At one level, Mr. Trump did one thing he by no means did as president — expressly referred to as on folks to take the coronavirus vaccines that he had pressed for and hoped would assist him in his re-election effort. However he mocked Mr. Biden for stumbling throughout a CNN city corridor occasion and attacked him over feedback the president made in regards to the restricted variety of vaccines obtainable when he took workplace.

Mr. Trump additionally mocked transgender individuals who take part in ladies’s sports activities. The feedback represented a way more forceful assault on transgender folks than his remarks whereas in workplace, when he positioned vital restrictions on L.G.B.T.Q.-related rights.

The previous president’s aides had been searching for a possibility for him to re-emerge and debated whether or not to placed on a rally-type occasion of their very own or benefit from the discussion board of CPAC, which relocated to Mr. Trump’s new house state from suburban Washington as a result of Florida has extra lenient coronavirus restrictions.

Mr. Trump and his aides labored with him on the speech for a number of days at his newly constructed workplace above the ballroom at Mar-a-Lago, his non-public membership close to the Atlantic Ocean. With out his Twitter feed, Mr. Trump has been utilizing particular moments — the demise of the radio host Rush Limbaugh and Tiger Woods’s automotive crash — to inject himself into the information cycle.

Outdoors ready statements, although, he has stated far much less since Jan. 20 about the way forward for the G.O.P. and his personal lingering ambitions.

Interviews at CPAC steered that a variety of conservatives, whereas nonetheless supportive of Mr. Trump, are ambivalent about whether or not he ought to run once more in 2024. That was borne out within the convention’s straw ballot, throughout which the previous president loved overwhelming approval — but in addition extra uncertainty about whether or not he ought to guide the get together in three years.

Thirty-two % of those that participated within the straw ballot — a closely conservative and self-selecting constituency — stated they didn’t need Mr. Trump to run once more or had been uncertain if he ought to.

Various would-be candidates, most notably Gov. Ron DeSantis of Florida and Gov. Kristi Noem of South Dakota, loved rousing receptions on the convention.

But Mr. Trump has primarily frozen the sector for the second. And he made clear in his speech that for now, he’s critical a few third bid.

That is new territory for Republicans, who had been largely keen to maneuver on from their dropping nominees in 2008 and 2012.

For now, although, Mr. Trump and the 2020 election are much more resonant. From the beginning on Sunday, the group supplied Mr. Trump with the adulation he craves, chanting, “We love you! We love you!” at one level. And he made clear that he believes that information organizations, and his supporters, nonetheless need the sugar excessive of his appearances.

After stepping as much as the lectern, Mr. Trump, gone for simply 5 weeks, requested the room, “Do you miss me but?”

Jonathan Martin reported from Orlando, Fla., and Maggie Haberman from New York. Erin Schaff contributed reporting from Orlando.