Schumer 'appalled' over Trump letter: 'Stop the pettiness'
Graham starts closed-door depositions in FISA probe
Senate Judiciary Committee Chairman Lindsey Graham (R-S.C.) said on Tuesday that he has started closed-door interviews as part of his deep dive into the surveillance courts and the FBI's Russia probe.
Graham confirmed to reporters that he has started the depositions, then escaped into a Senate elevator.
Graham is using his gavel to probe the Foreign Intelligence Surveillance Court (FISC) surveillance warrants involving Trump campaign associate Carter Page and the FBI's handling of the investigation into Russia's election meddling and the Trump campaign.
He's requested testimony from more than 20 current Justice Department and FBI officials.
He also wants to call former officials including former FBI Director James Comey, former Deputy Attorney General Rod Rosenstein and former Deputy Attorney General Sally Yates before his committee.
The deep dive comes amid growing concerns about the potential for abuse of the FISC after Justice Department Inspector General Michael Horowitz found 17 "significant inaccuracies and omissions" in the Page warrant application.
Some of President Trump's biggest allies want to use a debate over soon-to-expire provisions of the USA Freedom Act to make broader changes to the surveillance court.
Trump is convening a meeting on Tuesday afternoon with lawmakers on both sides of the debate to try to break the stalemate.
Congress has until March 15 to extend three provisions of the USA Freedom Act.