Providing the clearest indication yet that he is rapidly “putting together a war cabinet,” President Donald Trump announced in a tweet Thursday night that John Bolton—described by one commentator as the “most reckless and consistently wrongheaded extremist in American public life”—will replace H.R. McMaster as his national security adviser early next month.

“Bolton now represents the greatest threat to the United States.”
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Formerly the U.S. Ambassador to the United Nations during the Bush administration, Bolton was one of the most enthusiastic supporters of the invasion of Iraq and has over the past decade repeatedly called for war with Iran and North Korea as a regular guest on FOX News and in the op-ed pages of some of America’s most prominent right-wing editorial pages.

Though he reportedly promised Trump “he wouldn’t start any wars” if he got the position, foreign policy analysts and lawmakers argued on Thursday that Bolton’s long record of warmongering indicates that he will attempt to do precisely that.

“Bolton is an unhinged advocate for waging World War III,” Trita Parsi, president of the National Iranian American Council (NIAC), said in a statement in response to the news Thursday night. “Congress must do everything in its power to convince Trump to reconsider this decision and exert maximal pressure to constrain Bolton’s ability to impose irreparable harm to the U.S. and global security. Bolton now represents the greatest threat to the United States.”