Nunes cancelled this week's hearing, without explanation. The Washington Post may know why:

“As acting attorney general, [Sally] Yates played a key part in the investigation surrounding Michael T. Flynn, a Trump campaign aide who became national security adviser before revelations that he had discussed sanctions with the Russian ambassador to the United States in late December led to his ouster.

“Yates and another witness at the planned hearing, former CIA director John Brennan, had made clear to government officials by Thursday that their testimony to the committee probably would contradict some statements that White House officials had made, according to a person familiar with the matter who spoke on the condition of anonymity. The following day, when Yates’s lawyer sent a letter to the White House indicating that she still wanted to testify, the hearing was canceled.”