Bestselling author and conservative commentator Ann Coulter, once a diehard supporter of President Trump, now says the former celebrity businessman isn't the supreme dealmaker he claimed to be and that a better role for him might just be to serve as the Republican Party's spokesman.

In an interview Tuesday with the Washington Examiner, Coulter said specifically on immigration policy and his promise to build a wall on the Mexican border that Trump has fallen well short of his personally reinforced image as a master broker for his supporters.

"I think those claims have been exaggerated," said Coulter. "Wow, I've never seen such a bad dealmaker."

Trump has continued his calls for stricter immigration laws and has directed law enforcement to aggressively pursue illegal immigrants, but he has yet to usher any lasting legislation through Congress or secure funding for the promised wall.

[Trump: A blue wave 'means crime' and 'open borders']

She credited Trump for his political "instincts" but said that at least on immigration, he may be incapable of fulfilling his promise.

"I saw him speaking to [Immigration and Customs Enforcement] yesterday and you know, I love him," she said. "He should just be our spokesman. He should be forever our Republican spokesman. But somebody else has got to actually get it done."

Coulter's comments come despite her promoting a new book, Resistance Is Futile: How the Trump-Hating Left Lost Its Collective Mind, which is largely a defense of the White House and an scathing attack on Trump's critics.

"Trump may be shallow, narcissistic, disloyal, and the crudest kind of braggart, but he's like chemotherapy for the country," Coulter wrote in the book. "It's unpleasant to go through, you vomit, your hair falls out — but it kills cancer cells and you live."