welcome back to "hardball." it's been one week since former special counsel robert mueller testified on capitol hill, and the number of house democrats now supporting impeachment or impeachment hearings against trump continues to rise. since mueller's testimony, 20 morehouse democrats have joined the list. the total number of house members, democrats, 115. 114 are democrats, that includes independent congressman justin amash. but while democratic candidates attack president trump 34 times during last night's debate, not once in all those two hours did any candidate for president mention the word "impeachment." i'm joined by democratic congresswoman dina titus of nevada, who announced her support for an impeachment inquiry just this week, and michelle goldberg, columnist for "the new york times." congresswom congresswoman, last night nobody brought up impeachment. they're running against trump, and they never bring it up. what do you think that's about? >> well, i don't think they were