White House Press Secretary Sean Spicer has resigned after six months, an official has told NBC News.
The sudden departure comes as Donald Trump transition team official Anthony Scaramucci was slated to be announced as White House communications director.
Mr Spicer often found himself answering tough questions from reporters regarding Mr Trump’s campaign officials’ conversations with Moscow and the president’s tweets.
White House press briefings were increasingly marked by tense on-camera exchanges between Mr Spicer and journalists.
The controversial spokesman lambasted journalists over coverage of the crowd size at the President’s inauguration and stormed out of the briefing room without answering questions.
Deputy press secretary Sarah Huckabee Sanders had largely taken over the briefings, turning them into an off-camera event.
Mr Spicer spent several years leading communications at the Republican National Committee (RNC) before helping Mr Trump’s campaign during he presidential election.
A White House official said Mr Scaramucci’s appointment is expected to be announced on Friday. He did not immediately respond to a request from NBC News for comment.