A previously identified anti-Trump FBI agent allegedly broke protocol and played a critical role in opening and advancing the bureau’s original investigation related to the 2020 election, tying President Donald Trump to the probe without sufficient predication, whistleblower disclosures obtained by Sen. Chuck Grassley revealed. 

That investigation into Trump was formally opened by the FBI on April 13, 2022, and was known inside the bureau as "Arctic Frost," Fox News Digital has learned

Sen. Chuck Grassley, chair of the Senate Judiciary Committee, and Sen. Ron Johnson, Permanent Subcommittee on Investigations chair, shared internal FBI emails and predicating documents — legally protected whistleblower disclosures — exclusively with Fox News Digital.