Not sure what Trump could have on Putin that would interest the DOJ. And even if he wanted to, his ego is so massive and fragile at the same time he could never admit that he was someone else’s puppet. He always has to be one in charge.
This is different from his past problems where he could throw an lowly employee under the bus and claim he didn’t know about the illegal shit they were doing.
I’m not sure what there is to gain by him claiming that “the Koch Bros” put him up to it out sometime like that.