Donald Trump's former leading rivals for the Republican presidential nomination, Nikki Haley and Ron DeSantis, have offered full-throated endorsements of his candidacy at the party's convention.
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Haley, who had described Trump as unelectable and unfit for office during her campaign, nevertheless urged her supporters to vote for him over Democratic President Joe Biden "for the sake of our nation".
"You don't have to agree with Trump 100 per cent of the time to vote for him," the former UN ambassador and South Carolina governor said, after taking the stage to a mixture of cheers and boos. "Take it from me."
DeSantis, the conservative Florida governor whose campaign sputtered early in the year, received a warm welcome from the crowd as he attacked Biden as too old for the job.
Trump smiled and applauded from his box in the arena, where he sat alongside the running mate whose selection he unveiled on Monday, Senator JD Vance, himself a former fierce Trump critic who has become a staunch supporter.
The show of harmony was intended to contrast with the Democratic Party, which has spent weeks mired in intraparty tensions over whether Biden, 81, should abandon his re-election bid after his halting June 27 debate performance against Trump, 78.
The tenor of Tuesday evening's speeches in Milwaukee - centred on the theme of safety - was more aggressive than the first night, with speakers angrily denouncing Biden's southern border policies as putting the country's security at risk.
Kari Lake and Bernie Moreno, who are running in high-profile US Senate races in Arizona and Ohio, respectively, and US Senator Ted Cruz of Texas all called the flow of migrants an "invasion".
Cruz delivered remarks suffused with Trump's anti-immigrant rhetoric, blaming Democrats for what he said was a wave of violent crimes committed by migrants.
Trump entered the arena to a raucous ovation, just as he did on Monday in his first public appearance since a gunman tried to assassinate him on Saturday at a Pennsylvania campaign rally.
He was more ebullient than the night before, when he seemed emotional and more subdued than usual. A heavily bandaged ear served as a reminder of how narrowly he survived the attempt.
Authorities were still trying to identify a motive for the shooting. The 20-year-old gunman was killed at the scene by the US Secret Service.
Vance, 39, the author of the bestselling memoir Hillbilly Elegy, will deliver the headlining speech on Wednesday.
His presence on the ticket is likely to energise core Republican voters, but it is less clear whether he can appeal to more moderate voters, including independents.
A Reuters/Ipsos survey of 992 registered voters, conducted on Monday and Tuesday, found Trump leading Biden by 43 per cent to 41 per cent, within the margin of error.
In his first campaign speech since the assassination attempt, Biden told Black voters in Las Vegas he was "all in" for his re-election campaign, again dismissing calls from some Democrats to step aside.
The president said he was glad Trump had not been seriously injured but assailed his record in office. Biden has denounced the attack and called for less heated rhetoric.
The four-day convention will culminate with Trump's prime-time address on Thursday, when he formally accepts the party's nomination to face Biden in a rematch of their 2020 race.
Australian Associated Press
