That has included calling out Trump by name. In February, Pence said Trump was "wrong" to insist that Pence had the power to unilaterally overturn the results of the 2020 election - a power vice presidents do not possess. In a separate speech before top Republican donors, Pence urged the GOP to move on from Trump's election grievances and said there was "no room in this party for apologists" for Vladimir Putin after Trump praised the Russian leader's maneuvering as "genius" before his brutal invasion of Ukraine.
"Elections are about the future," Pence said in March. "My fellow Republicans, we can only win if we are united around an optimistic vision for the future based on our highest values. We cannot win by fighting yesterday's battles, or by relitigating the past."
In an interview with radio host John Fredericks on the conservative Real America's Voice, Trump declined to unleash on Pence when asked about his decision to campaign with Kemp.
"Well, Mike is trying to get involved and he's a very nice man," he said. "But he really let us all down."
The former president, meanwhile, continued to pan a trio of current and former Republican governors, including New Jersey's Chris Christie, whom he had previously labeled "RINOs" - or "Republicans in Name Only" - for supporting Kemp.
"We have to fight these people," Trump said Friday.
Earlier this week, Trump had said their support "tells you all you need to know about what you are getting in Georgia - just a continuation of bad elections and a real RINO if you vote for Brian Kemp."
"Maybe the 'R' in RINO really stands for reelected," Christie quipped back.
The Georgia race is a gamble for Trump, who notched a major victory in Ohio earlier this month when JD Vance, the candidate he endorsed, came from behind to win a competitive GOP Senate primary. But last week, his pick for governor in Nebraska, Charles Herbster, lost his primary amid groping allegations. And Trump faces further challenges ahead, including in Pennsylvania next week, where his pick for Senate, celebrity heart surgeon Mehmet Oz, is locked in a tight, three-way race.
Kemp had been substantially ahead of Perdue in polls in March and April, and many expect Kemp will be able to prevail without a June runoff, which would be triggered if no candidate won a majority of the vote.
Still, Trump voiced optimism for his candidate Friday, saying he'd been "hearing good things" about Perdue's standing. Perdue's campaign has argued this week that record turnout during Georgia's early-voting period, especially among Republicans who haven't traditionally voted in primaries, is good for their candidate. They claim pollsters have missed Perdue's support, although there's no way to know whom primary voters are selecting.
Perdue, a former senator, has also been lagging in fundraising and had about $900,000 cash on hand on April 30, less than a month before the May 24 primary, while Kemp had $10.7 million.
Trump's political action committee last month gave $500,000 to a group running attack ads against Kemp - his first major spending in any race this cycle, despite entering the year with more than $120 million in cash. Trump rallied for Perdue and his other favored candidates in Georgia in March, but hasn't scheduled a return.
But the Republican Governors Association has spent millions to support Kemp, exacerbating Perdue's financial disadvantage. Christie, Nebraska Gov. Pete Ricketts and Arizona Gov. Doug Ducey are all supposed to stump for Kemp in the closing days as part of that push.
In-state Republicans are also rallying to Kemp. Georgia House Speaker David Ralston, whose relationship to Kemp was rocky in the first 18 months of Kemp's term, said Thursday that "Gov. Kemp is my governor, and I'm going to support him," on Thursday after the governor signed the upcoming state budget in Ralston's hometown. Ralston said Kemp has "taken a lot of unfair hits."
The winner will face Democrat Stacey Abrams, who has raised more than $20 million so far and had $8 million in cash on April 30.
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Associated Press writer Jeff Amy contributed from Atlanta.