Rubio: Trump has 'improved significantly'
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Sen. Marco RubioMarco Antonio RubioRubio defends '3 point kick' analogy: 'You think everyone who follows politics knows what a field goal is?' Lawmakers to introduce bipartisan bill targeting China's treatment of Muslims Rubio cites Bible verse amid recount criticisms: ‘You cannot count what is not there’ MORE (R-Fla.), once Donald TrumpDonald John TrumpAvenatti ‘still considering’ presidential run despite domestic violence arrest Mulvaney positioning himself to be Commerce Secretary: report Kasich: Wouldn’t want presidential run to ‘diminish my voice’ 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 ClintonDemocrat Katie Porter unseats GOP's Mimi Walters Former Facebook security chief: 'I failed to prepare my employer' on Russian disinformation Rand Paul: Facebook must 'convince conservatives they're not the enemy' 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 CruzO'Rourke writes blog post describing a literal run from near the capitol to near the White House Cruz brushes off question about campaign claim on O'Rourke paying for caravan Texas New Members 2019 MORE has 565 and John Kasich has 153.