John Bolton ― who was notoriously hawkish with his strategy on Iran, North Korea and Syria ― will leave his position as White House national security adviser.

“I informed John Bolton last night that his services are no longer needed at the White House,” President Donald Trump announced Tuesday in a pair of tweets. “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.”

Bolton has continually supported and defended the U.S. invasion of Iraq. Critics have long panned his aggressive foreign policy approach and eagerness for war, both of which frequently clashed with Trump’s own approach to military intervention.

“I thank John very much for his service,” Trump said, noting that he plans to name Bolton’s replacement next week. Charlie Kupperman, who was deputy national security adviser under Bolton, will fill in as the acting adviser.

In a tweet of his own, Bolton said he had offered to resign Monday evening but Trump responded, “Let’s talk about it tomorrow.”

White House press secretary Stephanie Grisham took issue with Bolton’s apparent suggestion that he left voluntarily, claiming in a text to The Daily Beast that Trump had in fact demanded Bolton’s resignation.

The national security adviser was expected to appear at a White House security briefing early Tuesday afternoon alongside Secretary of State Mike Pompeo and Treasury Secretary Steven Mnuchin.

Bolton, who served in the Trump administration for more than a year, has worked for every Republican president since Ronald Reagan. He was Trump’s third national security adviser since his January 2017 inauguration, following Michael Flynn and H.R. McMaster. (Former President Barack Obama had three national security advisers over his two terms; President George W. Bush had two.)

Some of the president’s allies commended the decision to fire Bolton; Sen. Rand Paul (R-Ky.) said it was a “necessary action.”

California’s Democratic former Gov. Jerry Brown took a different tone: “Good riddance,” he said of the national security adviser.