Rubio: Trump has 'improved significantly'
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Sen. Marco RubioMarco Antonio RubioHillicon Valley: Biden administration sanctions Russia for SolarWinds hack, election interference Senators reintroduce bill to block NATO withdrawal New US sanctions further chill Biden-Putin relations MORE (R-Fla.), once Donald TrumpDonald TrumpBiden administration still seizing land near border despite plans to stop building wall: report Illinois House passes bill that would mandate Asian-American history lessons in schools Overnight Defense: Administration says 'low to moderate confidence' Russia behind Afghanistan troop bounties | 'Low to medium risk' of Russia invading Ukraine in next few weeks | Intelligence leaders face sharp questions during House worldwide threats he 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 ClintonChelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' Why does Bernie Sanders want to quash Elon Musk's dreams? Republican legislators target private sector election grants 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 CruzCruz no longer wearing mask in Capitol The Hill's Morning Report - Presented by Tax March - CDC in limbo on J&J vax verdict; Rep. Brady retiring Democrats brace for new 'defund the police' attacks MORE has 565 and John Kasich has 153.