In the first Cabinet shuffle of his second term, President Donald Trump on Thursday announced he's nominating Michael Waltz to be U.S. ambassador to the United Nations, while Secretary of State Marco Rubio will serve as interim national security adviser while keeping his current role as well.

Get all the news you need in your inbox each morning. But in a surprise move, the president said he wants Waltz to continue in his administration as the U.S. ambassador to the U.N.