US Homeland Security adviser Tom Bossert has resigned in the latest of a string of administration departures, the White House confirmed.
President Donald Trump “is grateful for Tom’s commitment to the safety and security of our great country,” White House spokeswoman Sarah Sanders said.
His exit comes just a day after former UN Ambassador John Bolton took over as Mr Trump’s national security adviser.
Nearly 30 White House officials have resigned or been fired under Mr Trump.
The White House statement on Tuesday did not include a reason for why Mr Bossert was leaving.
Image copyright Getty Images Image caption The White House did not specify a reason for Mr Bossert’s departure
US Department of Homeland Security Kirstjen Nielsen said in a statement: “Since the beginning of this Administration, Tom Bossert has provided wise counsel to the President on Homeland security issues. Over the last fifteen months I have enjoyed working with Tom on a range of current and emerging threats to our nation – particularly in cyber security and disaster response. We at DHS thank him for his partnership and service and wish him the best as he takes new steps in his career.”