Rubio: Trump has 'improved significantly'
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Sen. Marco RubioMarco Antonio RubioThe Memo: All eyes on faltering Biden ahead of first debate GOP lawmaker on Iran: Congress should vote on 'what's worthy of spilling American blood and what isn't' The Memo: Can Trump run as an outsider? MORE (R-Fla.), once Donald TrumpDonald John TrumpConway defends herself against Hatch Act allegations amid threat of subpoena How to defuse Gulf tensions and avoid war with Iran Trump says 'stubborn child' Fed 'blew it' by not cutting rates 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 ClintonThe Hill's Morning Report - Crunch time arrives for 2020 Dems with debates on deck The Memo: All eyes on faltering Biden ahead of first debate Trump says he's not prepared to lose in 2020 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 Cruz Hickenlooper, Bennet bring deep ties to 2020 debate stage 2020 Democrat Bennet releases comprehensive government reform plan GOP frets about Trump's poll numbers MORE has 565 and John Kasich has 153.