Michael Wolff, author of the best-selling book Fire and Fury: Inside the Trump White House, was cut off during an interview with Morning Joe co-host Mika Brzezinski over an unsubstantiated claim that the Ambassador to the United Nations Nikki Haley was somehow sexually involved with President Donald Trump.

Wolff first noted the claim, though he acknowledged he had no evidence to support it, on Real Time With Bill Maher last week, though he did not mention Haley by name. Wolff hinted to Maher that he suspected a White House affair was going on and though he hadn’t explicitly detailed it in his book, that there was a hint as to who it might be.

After the show, many point to the line in the book saying that Trump spends “a notable amount of private time with Haley,” as the basis for his remark.

Brzezinski shut Wolff down in an awkward and tense exchange that resulted in the author being kicked off the set.

“You might be having a fun time playing a little game dancing around this, but you’re slurring a women,” Brzenzski told Wolff.

Wolff denied making any such allegations against the U.N. ambassador, “she has been accused of nothing,” he said, “she has decided to deny what she has not been accused of.”

“You’re on the set of Morning Joe,” Brzezenski exclaimed, “we don’t BS here.” she then abruptly ended the exchange, “I’m sorry. This is awkward. You’re here on the set with us but we’re done.”

Wolff quickly took to Twitter to bash Brzenzski for embarrassing him on air, in a series of tweets.

Haley has since denied all rumors of an affair between herself and the president.