National Security Adviser Gen. H.R. McMaster is resigning from the Trump administration and will be replaced by former U.S. ambassador John Bolton, according to a tweet Thursday afternoon from President Donald Trump.

>> Read more trending newsWho is H.R. McMaster, Trump's national security advisor/

National Security Adviser H.R. McMaster attends a meeting between President Donald Trump and Crown Prince Mohammed bin Salman of the Kingdom of Saudi Arabia in the Oval Office at the White House on March 20, 2018 in Washington, D.C.

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Mathew Palmer, a former Delta Air Lines employee, at his home in Atlanta on Thursday, Oct. 9, 2025.  Palmer was fired less than two weeks after writing a post on social media about the assassination of conservative activist Charlie Kirk. (Natrice Miller/AJC)