PALM BEACH, FLA. -- Donald Trump has lost his social media megaphone, the power of government and the unequivocal support of his party's elected leaders. But a week after leaving the White House in disgrace, a large-scale Republican defection that would ultimately purge him from the party appears unlikely.

Many Republicans refuse to publicly defend Trump's role in sparking the deadly insurrection at the U.S. Capitol. But as the Senate prepares for an impeachment trial for Trump's incitement of the riot, few seem willing to hold the former president accountable.

After House Republicans who backed his impeachment found themselves facing intense backlash -- and Trump's lieutenants signalled the same fate would meet others who joined them -- Senate Republicans voted overwhelmingly Tuesday for an attempt to dismiss his second impeachment trial. Only five Republican senators rejected the challenge to the trial.

Trump's conviction was considered a real possibility just days ago after lawmakers whose lives were threatened by the mob weighed the appropriate consequences -- and the future of their party. But the Senate vote on Tuesday is a sign that while Trump may be held in low regard in Washington following the riots, a large swath of Republicans is leery of crossing his supporters, who remain the majority of the party's voters.

"The political winds within the Republican Party have blown in the opposite direction," said Ralph Reed, chair of the Faith and Freedom Coalition and a Trump ally. "Republicans have decided that even if one believes he made mistakes after the November election and on Jan. 6, the policies Trump championed and victories he won from judges to regulatory rollback to life to tax cuts were too great to allow the party to leave him on the battlefield."

The vote came after Trump, who decamped last week to his private Mar-a-Lago club in Palm Beach, Florida, began wading back into politics between rounds of golf. He took an early step into the Arkansas governor's race by endorsing former White House aide Sarah Huckabee Sanders, and backed Kelli Ward, an ally who won reelection as chair of Arizona's Republican Party after his endorsement.

At the same time, Trump's team has given allies an informal blessing to campaign against the 10 House Republicans who voted in favour of impeachment.

After Michigan Rep. Peter Meijer backed impeachment, Republican Tom Norton announced a primary challenge. Norton appeared on longtime Trump adviser Steve Bannon's podcast in a bid to raise campaign contributions.

On Thursday, another Trump loyalist, Rep. Matt Gaetz, plans to travel to Wyoming to condemn home-state Rep. Liz Cheney, a House GOP leader who said after the Capitol riot that "there has never been a greater betrayal by a president of the United States of his office and his oath to the Constitution."

Trump's eldest son, Donald Trump Jr. -- a star with Trump's loyal base --- has encouraged Gaetz on social media and embraced calls for Cheney's removal from House leadership.

Trump remains livid with Republican Gov. Brian Kemp of Georgia, who refused to support Trump's false charges that Georgia's elections were fraudulent. Kemp is up for reelection in 2022, and Trump has suggested former Rep. Doug Collins run against him.

Ohio Republican Sen. Rob Portman's decision not to seek reelection in 2022 opens the door for Rep. Jim Jordan, one of Trump's most enthusiastic supporters, to seek the seat. Several other Republicans, some far less supportive of the former president, are also considering running.

Trump's continued involvement in national politics so soon after his departure marks a dramatic break from past presidents, who typically stepped out of the spotlight, at least temporarily. Former President Barack Obama was famously seen kitesurfing on vacation with billionaire Richard Branson shortly after he left office, and former President George W. Bush took up painting.

Trump, who craves the media spotlight, was never expected to burrow out of public view.

"We will be back in some form," he told supporters at a farewell event before he left for Florida. But exactly what form that will take is a work in progress.

Trump remains deeply popular among Republican voters and is sitting on a huge pot of cash -- well over $50 million -- that he could use to prop up primary challenges against Republicans who backed his impeachment or refused to support his failed efforts to challenge the election results using bogus allegations of mass voter fraud in states like Georgia.

"POTUS told me after the election that he's going to be very involved," said Matt Schlapp, the chair of the American Conservative Union. "I think he's going to stay engaged. He's going to keep communicating. He's going to keep expressing his opinions. I, for one, think that's great, and I encouraged him to do that."

Aides say he also intends to dedicate himself to winning back the House and Senate for Republicans in 2022. But for now, they say their sights are on the trial.

"We're getting ready for an impeachment trial -- that's really the focus," said Trump adviser Jason Miller.

Trump aides have also spent recent days trying to assure Republicans that he is not currently planning to launch a third party -- an idea he has floated -- and will instead focus on using his clout in the Republican Party.

Sen. Kevin Cramer, R-N.D., said he received a call from Brian Jack, the former White House political director, on Saturday at home to assure him that Trump had no plans for defection.

"The main reason for the call was to make sure I knew from him that he's not starting a third party and if I would be helpful in squashing any rumours that he was starting a third party. And that his political activism or whatever role he would play going forward would be with the Republican Party, not as a third party," Cramer said.

The calls were first reported by Politico.

But the stakes remain high for Trump, whose legacy is a point of fierce contention in a Republican Party that is grappling with its identity after losing the White House and both chambers of Congress. Just three weeks after a pro-Trump mob stormed the Capitol, Trump's political standing among Republican leaders in Washington remains low.

"I don't know whether he incited it, but he was part of the problem, put it that way," said Alabama Sen. Tommy Tuberville, a strong Trump supporter, when asked about the Capitol siege and the related impeachment trial.

Tuberville did not say whether he would personally defend Trump in the trial, but he downplayed the prospect of negative consequences for those Republican senators who ultimately vote to convict him.

"I don't think there'll be any repercussions," Tuberville said. "People are going to vote how they feel anyway."

Trump maintains a strong base of support within the Republican National Committee and in state party leadership, but even there, Republican officials have dared to speak out against him in recent days in ways they did not before.

In Arizona, Ward, who had Trump's backing, was only narrowly reelected over the weekend, even as the party voted to censure a handful of Trump's Republican critics, including former Sen. Jeff Flake and Cindy McCain, the widow of Sen. John McCain.

At the same time, Trump's prospective impeachment sparked a bitter feud within the RNC.

In a private email exchange obtained by The Associated Press, RNC member Demetra DeMonte of Illinois proposed a resolution calling on every Republican senator to oppose what she called an "unconstitutional sham impeachment trial, motivated by a radical and reckless Democrat majority."

Bill Palatucci, a Republican committeeman from New Jersey, slapped back.

"His act of insurrection was an attack on our very democracy and deserves impeachment," Palatucci wrote.

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Peoples reported from New York. Associated Press writer Mary Clare Jalonick in Washington contributed to this report.