MSNBC host Joe Scarborough sharply criticized President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's first month in office in an appearance on "The Late Show" with Stephen Colbert, saying he wasn't sure his actions so far in the White House warranted being called "Mr. President."

In a discussion about whether Trump watches "Morning Joe" every morning, Scarborough told Colbert they sometimes call out to him on the air.

"Even when he claims he’s not watching the show and just sending out nasty tweets about it, we’ll look at the camera — Donald, we know you’re not watching the show, but how are you doing?" Scarborough explained.

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Colbert then called him out for referring to Trump as "Donald" instead of "Mr. President."

"We’re in a transition. We as a country are in a transition," Scarborough joked. "I’m trying to figure out — he’s been Donald Trump forever, he’s been Donald forever. It’s kind of hard to start calling him 'Mr. President.'"

"And I’ll be really honest with you, the way he’s acted over the past month has made it even harder to call him Mr. President."

Scarborough pointed specifically to Trump's criticism of the judiciary following a judge's ruling on his travel ban, and to his attacks on the media as examples of some of his erratic behavior.

"I think we as Americans should not cheer against our president ... I think we should pray for our president," he said. "But that requires all of us as Americans to do what we can when the president is not doing what he needs to be doing to stand up and do our part, too. And right now I think it’s the responsibility of all Americans, especially Republicans, and especially Republicans in the Senate."

"The Republican party needs to know, there is going to be a time after Donald Trump, and they are going to be judged for the next 50 years about how they respond to the challenges of today."