Rubio: Trump has 'improved significantly'
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Sen. Marco RubioMarco Antonio RubioFrustration boils over with Senate's 'legislative graveyard' Senate passes disaster aid bill after deal with Trump GOP senators work to get Trump on board with new disaster aid package MORE (R-Fla.), once Donald TrumpDonald John TrumpA better VA, with mental health services, is essential for America's veterans Pelosi, Nadler tangle on impeachment, contempt vote Trump arrives in Japan to kick off 4-day state visit 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 ClintonHillary Clinton slams Trump for spreading 'sexist trash' about Pelosi Gillibrand seizes on abortion debate to jump-start campaign DNC boss says candidates to be involved in debate lottery 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 CruzOn The Money: Conservative blocks disaster relief bill | Trade high on agenda as Trump heads to Japan | Boeing reportedly faces SEC probe over 737 Max | Study finds CEO pay rising twice as fast as worker pay Conservative blocks House passage of disaster relief bill The Hill's Morning Report — After contentious week, Trump heads for Japan MORE has 565 and John Kasich has 153.