Fox News host Tucker Carlson said this week that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE has not kept the promises he made on the campaign trail.

Carlson told Die Weltwoche, a weekly magazine in Switzerland,, that Trump's "chief promises" were that he would build a wall along the U.S.-Mexico border, defund Planned Parenthood and repeal the Affordable Care Act.

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"And he hasn't done any of those things," Carlson said. "I've come to believe that Trump's role is not as a conventional president who promises to get certain things achieved to the Congress and then does."

Carlson added that he doesn't think Trump is "capable" of fulfilling those promises.

"I don't think he's capable of sustained focus," Carlson said. "I don't think he understands the system. I don't think the Congress is on his side. I don't think his own agencies support him."

The conservative television host elaborated later in the interview, saying he doesn't think Trump can get things done because the legislative process is "highly complex."

"In order to do it you really have to understand how it works and you have to be very focused on getting it done, and he knows very little about the legislative process, hasn't learned anything, hasn't ... surrounded himself with people that can get it done, hasn't done all the things you need to do so," Carlson said.