Former US president Donald Trump was preparing to launch his third campaign for the White House on Tuesday, looking to move on from disappointing midterm defeats and defy history amid signs that his grip on the Republican Party is waning.

Trump had hoped to use the GOP's expected gains in last week's elections as a springboard to vault himself to his party's nomination. Instead, he finds himself being blamed for backing a series of losing candidates after Republicans failed to take control of the Senate. While the party was on the cusp of retaking control of the House on Tuesday, it could end up with its narrowest majority in decades.

"Hopefully, tomorrow will turn out to be one of the most important days in the history of our Country!" Trump wrote on his social media network on Monday. An announcement was expected at 9 pm EST on Tuesday from his club in Palm Beach.

Official paperwork forming the "Donald J Trump for President 2024" campaign committee was filed with the Federal Election Commission about half an hour before he was scheduled to speak.

Another campaign is a remarkable turn for any former president, much less one who made history as the first to be impeached twice and whose term ended with his supporters violently storming the US Capitol in a deadly bid to halt the peaceful transition of power on January 6, 2021. Just one president in US history has been elected to two nonconsecutive terms: Grover Cleveland in 1884 and 1892.

Trump is also facing a series of intensifying criminal investigations, including a Justice Department probe into the hundreds of documents with classified markings that were discovered in boxes and drawers at his Mar-a-Lago club.

Aides and allies had urged Trump to wait until after the midterms were over -- and then until after a December 6 Senate runoff election in Georgia -- to announce his plans. But Trump, eager to return to the spotlight, is also hoping to stave off a long list of potential challengers, including Florida Governor Ron DeSantis, who cruised to re-election last week and is now being urged by many in his party to run for president as well.

Trump has already begun to lash out at DeSantis publicly and on Tuesday, the Florida governor responded, dismissing the criticism as "noise".

"At the end of the day, I would just tell people to go check out the scoreboard from last Tuesday night," DeSantis told reporters.

Trump has tried to blame Senate Republican leader Mitch McConnell for the GOP's performance -- and McConnell allies have criticised Rick Scott, the Florida senator who heads the Senate Republicans' campaign committee.

However, Trump has received the brunt of criticism for elevating candidates in states like Pennsylvania and Arizona who were unappealing to general election voters because they embraced his lies about the 2020 election or held hard-line views on issues like abortion that were out of step with the mainstream

While Trump has the backing of the No. 3 House Republican, Rep. Elise Stefanik, others were already moving on.

Asked whether she would endorse Trump in 2024, Republican Sen. Cynthia Lummis of Wyoming told reporters on Monday: "I do not think that is the right question. I think the question is, who is the current leader of the Republican Party?"

Her answer to that question: "Ron DeSantis."

Sen. Mitt Romney, R-Utah, a longtime Trump critic, compared Trump to a pitcher who keeps losing after GOP disappointments in 2018, 2020 and now 2022.

"He has been on the mound and lost three straight games. If we want to start winning, we need someone else on the mound. And we have got a very strong bench that can come out," Romney said. "I know, there are some fans that love him. Just like, you know, an aging pitcher, they are always fans that want to keep them there forever. But if you keep losing games, try to put some new players on the field."

Others expressed concern that Trump's announcement would be a distraction from the Georgia race and urged potential candidates to focus there.

"What is really important for anybody who wants to be a 2024 candidate is to help us right now in 2022 to finish the cycle by winning the state of Georgia," said Sen. John Thune, R-SD.

"We obviously had higher expectation in the Senate, which did not pan out. I think there are a lot of different things that contribute to that," Thune added. "But I do think that, you know, folks who were unduly focused on the 2020 election, that is not a winning strategy with independent voices."

Even the former president's right-flank allies in the House Freedom Caucus kept their distance ahead of Trump's announcement.

"I am focused on what is happening here," said Rep. Scott Perry, R-Pa., the Freedom Caucus chairman, as lawmakers returned to Capitol Hill on Monday. "I am just not paying attention to any of those things, so I do not want to comment on that."

Meanwhile, in Utah, 86 Republican lawmakers on Monday sent out a news release urging DeSantis to run, reflecting dissatisfaction with having Trump as their party's standard-bearer. The state's Mormon majority has long been skeptical of Trump's isolationism and foul language

And in Michigan, Paul Cordes, chief of staff of the Michigan Republican Party, penned a four-page internal memo that criticised Trump-backed candidates for "statewide sweeps" that will give Democrats full control of the state's government for the first time in 40 years. That includes Tudor Dixon, who lost the governor's race to Democratic incumbent Gretchen Whitmer by double digits.

Trump, Cordes wrote, was "popular amongst our grassroots and a motivating factor for his supporters, but provided challenges on a statewide ballot, especially with independents and women in the midterm election".

Rep. Liz Cheney, another Trump critic who is considering her own run in 2024, highlighted losses by Trump-backed candidates while speaking on Tuesday morning at The Washington Post's Global Women's Summit.

"This is certainly not the rollout I am sure Donald Trump wanted for his announcement tonight. But it is also not the first time he has been totally detached from reality," Cheney said. "There is no question he is unfit for office. And I feel confident he will never be president again."

Meanwhile, Josh Holmes, a Republican consultant close to McConnell, said Trump remains "far and away the favourite" as he enters the race. But Holmes also said that a third presidential bid will be considerably different for Trump.

"There is never once been a primary victory by a presidential nominee that is waged in a backward-looking fashion. Everything is about the future," Holmes said.
As for DeSantis, Holmes said: "His national profile right now is undeniable.... We are going to find out" whether he can maintain that strength.