Marco Rubio will be the first person since Henry Kissinger in the 1970s to hold the positions of secretary of state and national security adviser simultaneously.

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.

White House national security adviser Mike Waltz is leaving the administration just weeks after it was revealed he added a journalist to a Signal chat being used to discuss military plans, according to two people familiar with the matter Thursday.