part of the republican argument that this has been a crusade from the beginning to get the president to impeach the president. that it might be something that will be seen as playing into republican hands if democrats then reach back into the mueller investigation and bring that into this debate as part of the articles of impeachment. when so much of the last several months have been spent discussing the president's conduct as it relates to ukraine. >> just because they talk about mueller and possible obstruction of justice on monday at this hearing, and just because they may allude to mueller, there may be ways for them to allude to mueller in the articles that don't include a specific article on the mueller investigation, yes? >> that's right. they can do it by establishing a pattern of behavior as abby was just saying. i expect them to do that. it's really hard to convince people of corruption cases even in a general run of the mill case and here the stakes are higher. it's important for them to establish why what was going on here was so dangerous and