Schumer, in a letter to McConnell on Monday, called for a hearing to be held on the whistleblower complaint and for Senate Republicans to issue a subpoena to force the administration to tun over the complaint to Congress.

"In the face of this dire warning and the Trump Administration’s effort to cover it up, the Republican-led Senate has remained silent and submissive, shying away from this institution’s constitutional obligation to conduct oversight," Schumer wrote.