Outgoing national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE on Tuesday disputed President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's account of his dismissal, tweeting that he offered to resign before the president announced his ouster.

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

I offered to resign last night and President Trump said, "Let's talk about it tomorrow." — John Bolton (@AmbJohnBolton) September 10, 2019

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The Washington Post reporter Robert Costa and other journalists said that Bolton had texted them to make clear that he resigned.

The messages came moments after Trump rocked Washington with a pair of tweets that said he had asked Bolton to step down due to disagreements about policy.

"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," Trump tweeted.

The president said he would name a replacement next week.

Bolton's exit came as his influence with the president waned and amid clashes with Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE, with whom Trump has a strong relationship.

Bolton came into the administration a fierce opponent of Iranian influence and a past supporter of regime change. While the Trump administration has hammered Iran with sanctions, the president has in recent months expressed an openness to meeting with Iranian leaders, a clear contrast to his national security adviser.

The president publicly rebuked Bolton during a trip to Japan earlier this year when he said he was not bothered by North Korea testing missile projectiles shortly after the adviser cited it as a violation of a United Nations resolution.

Bolton was a leading voice in the effort to oust Venezuelan President Nicolas Maduro. But months after the U.S. backed an opposition leader, Maduro remains in power and Trump has reportedly grown frustrated with the stagnant situation.