The newly appointed interim national security adviser is preparing to stay in that role for up to six months, a person close to him said.

U.S. President Donald Trump's national security adviser Mike Waltz is being forced out of his job, four people briefed on the matter said on Thursday, in the first major shakeup of Trump's inner circle since he took office in January.

National security adviser Mike Waltz is leaving his White House post, although soon after reports about his departure were published, President Trump announced he plans to nominate him to be ambassador to the United Nations.