Lawrence: Trump's nuclear attack comments are why the 25th Amendment exists

Tonight on The Last Word: A new poll finds Democratic voters are way more fired up to vote than GOP voters. Also, Democrat Josh Turek is vying to flip a Senate seat for Iowa. And MS NOW’s Ken Dilanian looks at Trump’s pardon for a Nevada GOP politician nicknamed “Lady Trump.” Marni von Wilpert, Iowa State Rep. Josh Turek, and Ken Dilanian join Lawrence O’Donnell.