President Donald Trump said on Tuesday that he fired his national security adviser, John Bolton.

Trump announced Bolton's dismissal on Twitter and said he'd announce a replacement next week.

"I disagreed strongly with many of his suggestions, as did others in the Administration, and therefore I asked John for his resignation, which was given to me this morning," Trump said.

Bolton rejected the notion that he was fired, saying he offered to resign on Monday night.

The White House press secretary, Stephanie Grisham, told Insider: "The President asked that Bolton's resignation be given to him this morning. It was."

Charlie Kupperman, the deputy national security adviser, will serve as the acting national security adviser until Bolton's replacement is announced.

Visit Business Insider's homepage for more stories.

President Donald Trump on Tuesday abruptly announced that he fired his national security adviser, John Bolton, and that he'd be naming a replacement next week.

Announcing Bolton's dismissal via Twitter, Trump said: "I informed John Bolton last night that his services are no longer needed at the White House. I disagreed strongly with many of his suggestions, as did others in the Administration, and therefore I asked John for his resignation, which was given to me this morning. I thank John very much for his service. I will be naming a new National Security Advisor next week."

Shortly after Trump's tweet, Bolton rejected the notion that he was dismissed and said he'd offered to resign on Monday night.

"I offered to resign last night and President Trump said, 'Let's talk about it tomorrow,'" Bolton tweeted.

The Washington Post reporter Robert Costa said Bolton told him in a text, "Let's be clear, I resigned, having offered to do so last night."

On Tuesday afternoon, the White House press secretary, Stephanie Grisham, told Insider: "The President asked that Bolton's resignation be given to him this morning. It was."

Charlie Kupperman, the deputy national security adviser, will serve as the acting national security adviser until Bolton's replacement is announced.

Bolton was among Trump's most hawkish advisers

The announcement came days after Trump said he invited Taliban leaders to Camp David for a secret meeting and then abruptly canceled it. Bolton, along with Vice President Mike Pence, was reportedly fervently opposed to Trump meeting with the leaders at the presidential retreat.

Trump on Monday railed against reporting that suggested he overruled Pence and other advisers in inviting the Taliban leaders to Camp David.

"A lot of Fake News is being reported that I overruled the VP and various advisers on a potential Camp David meeting with the Taliban. This Story is False! I always think it is good to meet and talk, but in this case I decided not to," he tweeted.

Read more: The GOP lawmakers disgusted by Trump's invitation to the Taliban are the latest sign his foreign policy is in shambles

Bolton had also reportedly butted heads with other top advisers in the administration in recent weeks, particularly Secretary of State Mike Pompeo.

Pompeo has been pushing for a peace deal with the Taliban and has defended Trump's decision to invite its leaders to Camp David, which was criticized by lawmakers on both sides of the aisle.

But The Post recently reported that Bolton, who opposed peace negotiations with the Taliban, was sidelined as the administration sought to finalize a deal that would see US troops withdraw from Afghanistan and lay the foundations for ending the longest war in US history.

Read more: Meet John Bolton, an architect of the Iraq War who just got fired from his job as Trump's national security adviser

Bolton, a foreign-policy veteran who also advised President George W. Bush and is considered one of the architects of the Iraq War, was Trump's third national security adviser, after Michael Flynn and H.R. McMaster.

He's long had a reputation as a hawk, particularly when it comes to Iran. As tensions between Washington and Tehran have escalated in recent months, many in the US foreign-policy community have expressed concerns that Bolton was pushing the administration toward another war in the Middle East.

Bolton's departure is just the latest in a White House that has seen an unusually high rate of turnover.