gop lost in the midterm. foreign policy. military success. which trump hasn't seen much of. and incumbent charisma. the appeal to voters is limited. how can impeachment lead to checking off more on this list? this one especially the one where it leads to impeachment. explain. >> it would check off key number nine. the scandal. that's a fourth key. that gives him only a two key cushion. if two things go wrong he's out. if the economy tilts into recession. if there's a democratic nominee. or a big foreign policy failure. he's out. the key is a trigger effect. this impeachment process the three steps could well so weaken him. even if he's not convicted by the senate. a real challenge to the renomination. that's another key. or a serious third party.