WASHINGTON – Roger Stone, a former political adviser and longtime friend of President Donald Trump, mocked the death of former first lady Barbara Bush on Instagram after a new book chronicled her criticism of the current president.

"She had a 'countdown clock' for @realdonaldtrump presidency?" Stone wrote Friday on Instagram. "Well she’s dead and he’s president- who won that one? Nasty, rude, vindictive, entitled, self-important - that’s the woman I had several unpleasant encounters with."

Stone appeared to be responding to Bush's criticism of Trump that was included in a biography published this month, "The Matriarch: Barbara Bush and the Making of an American Dynasty," by USA TODAY Washington Bureau chief Susan Page.

Excerpts of the book were first published in USA TODAY last month.

Bush blamed Trump for aggravating her long battle with congestive heart failure and chronic pulmonary disease in the book. Bush also told Page that she'd "probably say no" when asked if she still considered herself a Republican.

The book also revealed that Bush wrote in her son, Jeb Bush, who lost in the primary to Trump, on her ballot in 2016 and that she kept a countdown clock marking the end of Trump's term on a table next to her bed.

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Stone, who's known for his colorful posts to social media, was charged in February with seven criminal counts, including obstruction and witness tampering, as part of special counsel Robert Mueller’s wide-ranging inquiry into election interference by the Kremlin. He was the last individual indicted by Mueller before the lengthy probe was completed, finding that the Trump campaign did not conspire with Russia during the 2016 election, according to Attorney General William Barr.

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Stone's frequent social media posts got him in trouble with a federal judge in February after he posted a photo of U.S. District Judge Amy Berman Jackson with crosshairs near her head.

"Thank you, but the apology rings quite hollow," she told Stone after he apologized. "There's nothing ambiguous about crosshairs."

Bush, who died a year ago this month, and her family had a tense relationship with Trump, who frequently criticized former President George W. Bush on the campaign trail in 2016. Trump also frequently derided former Florida Gov. Jeb Bush, one of his opponents for the 2016 Republican presidential nomination, dubbing him "low energy Jeb."

"I'm trying not to think about it," Barbara Bush said in an interview that took place in 2018 as the first anniversary of Trump's election approached. "We're a strong country, and I think it will all work out.”

Stone's post on Friday was the second one attacking Bush since the book was released.

Earlier this week, Stone posted another photo of Bush with a caption attacking her character, calling her a "mean spirited, self important, nasty and entitled woman."

The president has also responded to Bush's criticism outlined in the book, saying he was not surprised by her words given his role in defeating her son during the 2016 race.

“I have heard that she was nasty to me, but she should be," the president told The Washington Times in an interview. "Look what I did to her sons.”

Barbara Bush died last year in April at the age of 92 and her husband, former President George H.W. Bush, died in November at 94.

Contributing: Sean Rossman and Susan Page