President Trump on Tuesday accused top Democrats of losing their minds after House Judiciary Committee Chairman Jerry Nadler launched an investigation into Trump’s campaign, businesses, presidential transition, and administration.

Nadler, D-N.Y., said Monday his committee has requested documents from 81 agencies, entities, and individuals that it believes has information connected to its investigation. But Trump claimed Democrats were only going after him because the investigation into Russian interference in the 2016 election so far hasn’t found any evidence of collusion with Russia.