Rubio: Trump has 'improved significantly'
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Sen. Marco RubioMarco Antonio RubioThe Memo: 'Whistleblower' furor gains steam Liberal super PAC launches browser extension replacing 'Mitch McConnell' with 'Moscow Mitch' Trump faces difficult balancing act with reelection campaign MORE (R-Fla.), once Donald TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' MORE's bitter rival for the presidential nomination, appears to be warming to the GOP front-runner.

“[Trump’s] performance has improved significantly,” Rubio said, according to The Palm Beach Post.

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In a separate interview, Rubio said the GOP should avoid a divisive battle for the nomination.

“Look, let’s not divide the party,” he told Miami radio host Jimmy Cefalo, according to The Tampa Bay Times.

“I do think it's valid to argue to delegates: 'Look, let’s not divide the party. You have someone here who has all these votes, very close to get 1,237, let’s not ignore the will of the people or they’re going to be angry.' And delegates may decide that on that reason they decide to vote for Donald Trump. But if they don’t, it’s not illegitimate in any way,” Rubio said.

“I’ve always said that I will support the Republican nominee, and that’s especially true now that it’s apparent that Hillary ClintonHillary Diane Rodham ClintonDemocrats go all out to court young voters for 2020 Pelosi: Whistleblower complaint 'must be addressed immediately' Election meddling has become the new normal of US diplomacy MORE will be the Democratic nominee.”

Rubio suspended his White House run last month after losing badly to Trump in his home state.

Trump has a big edge in the GOP presidential race, with 996 delegates, according to The Associated Press. Rival Ted CruzRafael (Ted) Edward CruzTrump walks tightrope on gun control State Department's top arms control official leaving Sanders NASA plan is definitely Earth first MORE has 565 and John Kasich has 153.