The iconic Andrea Mitchell signs off from Andrea Mitchell Reports after 17 years in the anchor chair. She will continue with NBC News, as chief Washington correspondent and chief foreign affairs correspondent. | MS NOW

WATCH: Andrea Mitchell asks Joe Biden about Speaker Pelosi’s suggestion that he should not debate President Trump. Joe Biden: “As long as the commission continues down the straight and narrow, as they have, I’m going to debate him.” | Meet the Press

WATCH: NBC's Andrea Mitchell, who has covered Hillary Clinton's decades in public life, discusses the historic nature of Clinton's speech tonight. "This is a moment that has been many years in the making. She has had a lot of missteps...but this is a moment that really is historic in every sense of the word." | Meet the Press

The White House said Monday it was reviewing how Jeffrey Goldberg, the editor-in-chief of The Atlantic magazine, was accidentally added to an encrypted group text with people who appeared to be members of President Donald Trump’s administration. In the chat, they discussed plans to launch airstrikes against Houthi militants in Yemen. NBC News' Andrea Mitchell reports on the situation and interviews Goldberg about the remarkable lapse. | NBC Nightly News with Tom Llamas