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“This is a new direction for the campaign,” he said Monday on Fox News’s “On The Record." "This is sort of the professionalization that continues. There’s no way to work a presidential campaign with competing factions. It just doesn’t work. There’s four to five months left.

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“I thought it was very classy how he handled today. To me, when I see something like this, I see a pivot to the general, a seriousness to the general, that looks good for getting this campaign to a place where he can compete with Hillary Clinton.”

Trump, the presumptive Republican nominee for president, on Monday fired campaign manager Corey Lewandowski amid simmering tensions within the businessman’s camp.

Lewandowski allegedly struggled with campaign chairman Paul Manafort over who wielded more influence on Trump’s team.

Barry Bennett, a senior Trump adviser, said earlier Monday that Manafort is “totally in charge” after Lewandowski’s exit.

Priebus later Monday praised Manafort’s potential for righting Trump’s ship ahead of November’s general election.

“Paul Manafort’s a pro,” he said. "I think this pivot, this seriousness you’re seeing right now, people should look at it as a good thing.

“I think there’s a lot of loyalty,” Priebus added of Trump’s staff. "I think there’s been a lot of ups and downs. It’s not just for someone to win an election, it’s for the future of the country.”

Priebus added the RNC has modernized its national infrastructure so Trump can make the best possible showing against Clinton, the presumptive Democratic nominee.

“We have done a very good job getting our ground game to a place it hasn’t been in decades,” he said. "These are the things that allow us to win very close elections.

“The [Democratic National Committee] doesn’t have a ground game. If you compare the RNC versus the DNC, there’s no competition. If you don’t have your mechanics straight, you can’t win."