President Donald Trump — who doesn’t

As recounted in the new book 

Guilfoyle, a former Fox News host, has been dating Donald Trump Jr. since Don. Jr’s wife, Vanessa, announced she was divorcing him last March. (They finalized their divorce agreement at the end of last year; Vanessa has been publicly supportive of the pair.)

In an “hour-plus-long riff about politics, policy, sports, and culture” while speaking at the September fundraiser, according to

And he mentioned Newsom, who was on the verge of being elected governor.

“Kimberly, you know him, right?” Trump said, addressing Guilfoyle, who was at the event, according to 

“There was some awkward, tepid laughter around the room,” authors Anna Palmer and Jake Sherman wrote.

The White House did not respond to a request for comment on their book.

RELATED: As the President Goes on the Attack, Don Jr. and Girlfriend Kimberly Guilfoyle Head to Florida for St. Patrick’s Day

Guilfoyle,  50, and Newsom, 51, were married from 2001 to 2006, overlapping with his time as mayor of San Francisco.

In January 2005, they announced their split, reportedly saying in a statement then: “Unfortunately, the demands of our respective careers have made it too difficult for us to continue as a married couple. Over the past 10 years, we have developed a tremendous bond of love and respect for each other. That will never change.”

RELATED: Donald Trump Jr. Celebrates Girlfriend Kimberly Guilfoyle’s Birthday at Mar-a-Lago Weeks After Announcing His Finalized Divorce

However, one friend told the 

Said another friend: “Were there problems? Yes — that’s pretty much been an open secret for months.”

RELATED VIDEO: Donald Trump Jr. Brings Girlfriend Kimberly Guilfoyle to White House for July 4th Celebration

Asked in September about Guilfoyle’s relationship with 41-year-old Don Jr., Newsom said, “I wish her well and them well. And we see the world, clearly, with a different set of eyes politically.”

In an interview with BuzzFeed last month, he was somewhat circumspect about whether President Trump ever referenced Guilfoyle’s new relationship with him.

“We may have had a private moment on that conversation,” Newsom said, “which in and of itself, makes life just interesting.”

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