President Trump spoke to reporters from Air Force One Sunday night, answering questions from the national security advisor to an offer to send troops to Mexico to fight cartels.

You can't run anything, much less the United States is a national security policy without having people who are willing to put uncomfortable truths in front of the president,” the Connecticut Democrat said.

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.