Special counsel Robert Mueller and his team have multiple conflicts of interest due to ties to Democrats, according to Newt Gingrich.
"I don't understand why the House and Senate Judiciary Committees aren't investigating a lot of this stuff," the former House speaker said Thursday on Fox News' "Hannity."
He said leaks of information must be coming from Mueller's team.
"So who's leaking? Why is nothing being done about it? Why are people not being fired? I think it's very reasonable to say that this is a very dangerous witch hunt that Mueller keeps expanding because he can't find anything in the original charge."
The Mueller team will prosecute someone in its investigation into alleged collusion with Russia, Gingrich said.
"There are too many lawyers being paid too much money for them to go home having accomplished nothing," he added.