Ohio Republican Rep. Jim Jordan announced that the House Judiciary Committee has begun looking into reports that the Justice Department spied on members of Congress and their staff.

Iowa GOP Sen. Chuck Grassley is also looking into allegations that the Department of Justice spied on his former chief investigative counsel, Jason Foster. On Tuesday, Jordan made the investigation public on Fox Business.“We now know that they spied on congressional staffers,” Jordan said in an appearance on Fox Business’s The Evening Edit with Elizabeth MacDonald. “We want to know, how far does it go? Were they spying on members? Were they spying on other staffers? Keep this in mind, Liz: We know they spied on President Trump’s campaign. We know all that from the FISA Court and what they did with Carter Page and Papadopoulos—everything else. Now we’ve learned that they spied on one of Sen. Grassley’s staff members, Jason Foster.”

“We want to know, does it go further?” he stressed. “So we’ve sent letters not only to the Department of Justice but to all these carriers that the Department of Justice worked with to get the phone records and the email records from congressional staffers like Mr. Foster. How far does this go? Were they spying on members and other staff?”

Jordan wrote to Alphabet, Apple, AT&T, T-Mobile, and Verizon’s CEOs, as well as Attorney General Merrick Garland, requesting information about the DOJ’s alleged attempts to obtain the private communications of members of Congress and their staff as part of the investigation.