The Senate Judiciary Committee has invited former FBI Director James Comey to testify. Comey was invited by Sens. Dianne Feinstein (D-CA) and Chuck Grassley (R-IA).
BREAKING: Top members of Senate Judiciary Committee invite former FBI Director James Comey to testify— The Associated Press (@AP) May 18, 2017
He has also been invited by the Senate Intelligence Committee and by the House Oversight Committee.
It is unknown whether or not he'll actually testify.