You are misrepresenting his words...shocking.
“Of course,” Dershowitz replied. “And there is enough to investigate. There’s a big gulf between ‘enough to investigate’ [and] enough to establish probable cause, enough to indict — we’re not even close to [the latter], but enough to investigate? Of course. I mean, the FBI statement by the so-called reliable informant, if they believe it to be true, gives them enough to investigate.
He said that there is enough to investigate and with a Republican led house they can impeach, to be tit for tat. An investigation is already occurring and have been for 4 years. It started under Trump (which should bother the crowd of don't investigate your political rival).