From the NY Times this morning:
“Mr. Trump didn’t fire Mr. Flynn this week for chummily discussing American sanctions on Russia with Moscow’s ambassador, or for lying about it. Mr. Trump knew all that for weeks. He fired Mr. Flynn after both of them got caught.”
This is the crux of it. The Democrats need to systematically build a case against him and hopefully Pence will get caught in it too. Ryan is a jerk, but he’s no doubt a more stable jerk than Trump and Pence.