Former special counsel Jack Smith tracked the private phone communications of nearly a dozen Republican senators during his investigation into the Jan. 6, 2021, Capitol riot, Sen. Chuck Grassley (R-IA) revealed Monday.

Deputy FBI Director Dan Bongino briefed lawmakers Monday afternoon on Capitol Hill, saying Smith’s team tracked phone records and calls from major carriers in 2023 under an FBI investigation codenamed “Arctic Frost.” The effort included “tolling data” on calls made by Sens. Lindsey Graham (R-SC), Josh Hawley (R-MO), Marsha Blackburn (R-TN), Ron Johnson (R-WI), and one House Republican, Rep. Mike Kelly (PA), according to supporting documents sent to Grassley by the bureau.