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Former national security adviser John Bolton says he is now willing to testify in the Senate impeachment trial if subpoenaed.

In a statement obtained by NBC News, Bolton writes, "I have concluded that, if the Senate issues a subpoena for my testimony, I am prepared to testify."

Congratulations to all involved in eliminating Qassem Soleimani. Long in the making, this was a decisive blow against Iran's malign Quds Force activities worldwide. Hope this is the first step to regime change in Tehran.

— John Bolton (@AmbJohnBolton) January 3, 2020

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John Bolton will speak in his book, if not at the Senate trial.

The Senate is still discussing whether it will hear witness testimony from John Bolton, the former national security adviser, who has said he would comply with a subpoena during the impeachment trial. But he’s planning to reveal some of what he saw regarding the Ukraine matter in his upcoming book, according to people familiar with the plan.

Mr. Bolton’s book, due to be published by Simon and Schuster, is almost finished, according to people familiar with his plans, and is set to be on sale well ahead of the Republican and Democratic National Conventions this summer. The book is going to describe Mr. Bolton’s time in the Trump White House and expand on at least some of what he saw regarding Mr. Trump’s efforts to pressure Ukrainian officials into announcing an investigation into Hunter Biden, the son of former Vice President Joseph R. Biden.

The book will describe other global controversies related to Russia and Venezuela, and Mr. Bolton plans to detail his interactions with key figures in Mr. Trump’s administration. Some officials do not come off particularly well, according to the people familiar with the plan. They include the former United States ambassador to the United Nations, Nikki Haley, who held the job Mr. Bolton did during President George W. Bush’s administration, Secretary of State Mike Pompeo, and Mick Mulvaney, the acting White House chief of staff. A spokesman for Simon and Schuster did not respond to an email seeking comment.

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President Trump's former national security adviser John Bolton alleges in his forthcoming book that the president explicitly told him "he wanted to continue freezing $391 million in security assistance to Ukraine until officials there helped with investigations into Democrats including the Bidens," the New York Times first reported.

Why this matters: The revelations present a dramatic eleventh-hour turn in Trump's Senate impeachment trial. They directly contradict Trump's claim that he never tied the holdup of Ukrainian aid to his demands for investigations into his political opponent Joe Biden. Trump strongly denied Bolton's claims early Monday.

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John Bolton denied Monday that he, his publisher or his literary agent coordinated with the New York Times on a bombshell report that his forthcoming book says that President Trump explicitly told him that a freeze on military aid to Ukraine was tied to an investigation of his political opponents.

"Ambassador John Bolton, Simon & Schuster, and Javelin Literary categorically state that there was absolutely no coordination with the New York Times or anyone else regarding the appearance of information about his book, THE ROOM WHERE IT HAPPENED, at online booksellers. Any assertion to the contrary is unfounded speculation."

Why it matters: The statement pushes back on what's already become a talking point among pro-Trump Republican senators and media — that the leak was specifically timed to drive up sales and interest in Bolton's book, especially given the fact that it became available to preorder shortly after the Times published its report.