CNN’s Jake Tapper told Ellen DeGeneres on Tuesday 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 “lost his mojo” when it comes to handing out catchy nicknames.

“I’ll be honest. President Trump has a lot of skills and I used to think his branding skill was amazing,” Tapper said in a clip released from his appearance on “The Ellen DeGeneres Show.”

“He’s kind of lost his mojo on the nickname front,” Tapper said, mentioning the president’s recent attacks on former FBI director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE.

“He tried to do it with Comey and he’s been trying out all these different nicknames,” Tapper said. “He had ‘Lyin’ Comey’ and that didn’t seem to work. ‘Liar and Leaker’ Comey … ‘slime ball’, first two words, then ‘slimeball’ one word.”

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“He’s clearly trying new material, as one does,” Tapper said. “It hasn’t really caught on. I don’t know if he’s just so ensconced in the White House he’s lost his ability to do it.”

DeGeneres noted that Trump hasn't bestowed a nickname on Tapper.

“He doesn’t personally go after you because you don’t have a nickname yet,” she said. “Because when you have a nickname is when you’re really the target.”

Trump did refer to Tapper as a CNN “flunky” in a tweet earlier this year.

“It was disappointing,” Tapper said. “Come on. Show up.”

Tapper also told DeGeneres that it doesn’t really bother him when Trump goes after CNN and attacks it as “fake news.”

“It bothers me when he goes after the media over and over again and he seems to use the term ‘fake news’ almost exclusively to mean ‘news that is true but I don’t like,'” Tapper said. “I think it should bother every American."

Tapper, CNN’s chief Washington correspondent, released his political thriller “The HellFire Club” on Tuesday.