If Manafort had anything to make a deal with ( against Trump), wouldn't he have used it before the jury found him guilty on a multitude of crimes that can put him being bars for decades..the new deal, as I understand it, only involves new charges and less than 10 yrs.....IMO there could be a lot of ppl in Washington charged with not registering a foreign agent( fraud, tax evasion, using public office for personal profit,etc) because nearly every Congress person are lining their pockets to vote on issues pertaining to foreign Govt policy...we really don't think those MFs got to be worth 20 million in 4-8 yrs on 150 k salaries....do we?  Remember,  Manafort has worked both side of ailes for getting electoral votes....im not saying Mueller is a good person, by any means, but this plea could really blow up into something huge...like boom!!!!