Senate Judiciary Committee Chairman Chuck Grassley on Wednesday rejected the idea of having the FBI investigate sexual assault claims against Supreme Court nominee Brett Kavanaugh, and said he is still working to have Kavanaugh’s accuser, Christine Blasey Ford, testify in his committee next week.

“No other OUTSIDE investigation is necessary for the Cmte to do its investigation,” Grassley tweeted Wednesday morning. “Don’t know why Dems are refusing to cooperate in the cmte’s investigation I hope Dems will join me.”