Very good question. He actually did worse he called them there with the promise to go with them to Congress and speak before them. He also said there would be new evidence presented.

Neither of those things happened. He then turned Benedict Arnold to his supporters who he asked there after he knew and even told them to move on the house and senate??

It feels like either they got to him or he was a pretender and never who we hoped him to be. Either way I got to admit I haven't felt the same about him since.