Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) reportedly warned President Trump that former White House chief strategist Stephen Bannon could be undermining the president's agenda.

McConnell made the comments to Trump during a lunch the two had Monday at the White House, the Washington Examiner reported.

The Kentucky Republican warned that Bannon's push to find challengers for GOP lawmakers could make it difficult to accomplish key agenda items, like tax reform, as some of the Republicans Bannon is targeting are key supporters.

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When asked Monday following the lunch meeting about Bannon's efforts, Trump said some of the people Bannon is looking at are "great people."

"I like Steve a lot. Steve is doing what Steve thinks is the right thing," Trump said.

"Some of the people that he may be looking at, I'm going to see if we talk him out of that, because frankly they're great people."

Bannon has vowed to back primary challenges to Senate Republicans who oppose Trump. Over the weekend, he declared a "season of war" on the GOP establishment.

Trump said Monday he has a good relationship with most Republicans in the Senate and the House, with a few exceptions.

“Maybe with the exception of a few, I have a fantastic relationship with the people in the Senate and Congress,” Trump said.

“I’m friends with most of them. I like and respect most of them, and I think they like and respect me. The Republican Party is very, very unified.”