Rachel Maddow offers an exclusive look at newly obtained documents, one of which appears to be a letter from former acting attorney general Dana Boente informing the Department of Justice that he has been asked to testify for Robert Mueller's investigation.

Rachel Maddow shares new NBC News reporting that because Donald Trump has backed out of the idea submitting to an interview with Robert Mueller, the investigation can procede to the next phase, closing the obstruction part of their inquiry with a focus on four key findings findings in Trump's attempt to obstruct justice.