The Senate’s senior Republican revealed new documents Tuesday that he said show more “weaponization” by the FBI against President Trump and his allies, including one that details an effort soon after the 2017 inauguration to find information that “could predicate a case.”

Senate Judiciary Committee Chairman Charles E. Grassley also said email from now-ousted Supervisory Special Agent Timothy Thibault said the FBI wasn’t “close” to opening a case but was “aggressively seeking out” open-source information and human sources that would lead to a case on the Trump 2016 campaign.

Other documents detailed the FBI’s surveillance of Peter Navarro, a Trump aide who was convicted of contempt of Congress for refusing to testify about events involving the Jan. 6, 2021, riot at the U.S. Capitol.

Mr. Grassley, Iowa Republican, said the documents show the FBI could have arrested Mr. Navarro at his home but instead waited to arrest him in public at Ronald Reagan Washington National Airport.

“The way Navarro was treated was unnecessary,” Mr. Grassley said.

The revelations came a day after Mr. Grassley revealed the FBI sought phone records on eight sitting senators in 2023 as part of its investigation into the events of the Jan. 6 attack on the Capitol, which turned into the Arctic Frost investigation that ended with Mr. Trump’s indictment on charges related to the 2020 election.

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Attorney General Pam Bondi, testifying Tuesday to the Judiciary Committee, called that a “historic betrayal of public trust.”

Ms. Bondi said in total, they have identified 92 Republican individuals and GOP-friendly groups that were targeted for intrusive scrutiny by the FBI.

“Arctic Frost was an unconstitutional, undemocratic abuse of power,” the attorney general said. “This is the kind of conduct that shattered the American people’s faith in our government.”

“We are ending this weaponization,” she said.

Mr. Grassley also revealed another document he said showed the FBI in 2017 was pursuing a “McAuliffe case” where it obtained information about a “pass through … to pay former POTUS” — apparently former President Bill Clinton.

The senator asked Ms. Bondi to figure out if the FBI pursued that case as relentlessly as it pursued Mr. Trump.

• Stephen Dinan can be reached at sdinan@washingtontimes.com.