at democrats. and at his own executive branch. plus, new reporting alleges russian hacking days before the election at the department of justice announces an arrest. then, comey day is coming. >> the dinner was arranged. i think he asked for the dinner. >> why the white house is backing off claims of executive privilege and what that means for thursday's hearing. and about those taxes. >> the only one that cares about my tax returns are the reporters, okay? they're the only ones. >> we have an answer from the white house on the president's tax returns. when "all in" starts right now. good evening from new york. i'm chris hayes. as london stood defiant today in the face of a ghastly terrorist attack, president trump renewed his attack on the city's mayor. >> my no cuss since saturday has been dealing with the horrific attack on our city, on londoners. and on visitors.