Tucker Carlson is usually quick to go after critics of President Donald Trump on his nightly Fox News show.

But in a new interview with conservative Swiss magazine Die Weltwoche, the Tucker Carlson Tonight host called out Trump himself for his boastfulness and for failing to keep his promises to voters.

His chief promises were that he would build the wall, de-fund Planned Parenthood and repeal Obamacare, and he hasnt done any of those things, said Carlson, per The Washington Post.

Carlson said hed come to believe Trumps role was not as a conventional president who promises to get certain things achieved to the Congress and then does.

I dont think hes capable , Carlson explained. I dont think hes capable of sustained focus. I dont think he understands the system. I dont think the Congress is on his side. I dont think his own agencies support him. Hes not going to do that.

Carlson said it was mostly Trumps fault that he hadnt been able to deliver on his pledges, because you really have to understand how the legislative process works and be very focused on getting it done.

Trump knows very little about the legislative process, hasnt learned anything, hasnt surrounded himself with people that can get it done, hasnt done all the things you need to do so. Its mostly his fault that he hasnt achieved those things. Im not in charge of Trump, he added.

Instead, Carlson suggested Trumps role had been to begin the conversation on issues such as immigration which the conservative TV host has frequently and fervently railed against.

Carlson criticized Trump in March for suggesting guns should be preemptively removed from potentially dangerous people, and in January for hinting at a deal to protect young undocumented immigrants.