Tonight on The Last Word: Donald Trump attacks MSNBC in a late night social media post. Also, Trump reportedly ignored his attorney's warnings to comply with the classified documents probe subpoena. Plus, Senate Democrats plan to vote on the subpoenas in the Supreme Court ethics probe. And a Biden campaign ad warns younger Americans about Trump's renewed push to repeal Obamacare. Jelani Cobb, Andrew Weissmann, Sen. Sheldon Whitehouse and Rep. Maxwell Frost join Lawrence O'Donnell.