The Senate Judiciary Committee is examining whether the Justice Department improperly moved to shut down an inquiry into the Clinton campaign’s funding of the Steele dossier.Committee Chairman Sen. Charles E. Grassley said a whistleblower has alleged that two senior officials involved in the Justice Department’s Arctic Frost investigation of President Trump previously played key roles in blocking an FBI probe into Hillary Clinton and other Democrats, the Washington Times reported on Friday.

Grassley, a Republican from Iowa, released email exchanges from June 2019 between an unidentified FBI agent and Richard Pilger, then an official in the Justice Department’s Public Integrity Section, along with J.P. Cooney, who at the time served as a prosecutor in the U.S. Attorney’s Office for the District of Columbia.The emails show Pilger and Cooney rejecting the agent’s questions regarding what the agent described as the “unambiguous concealment” of payments made by the Democratic National Committee and the Clinton campaign to fund the Steele dossier, compiled by former British intelligence officer Christopher Steele.

The DNC and Hillary Clinton’s 2016 presidential campaign hired the research firm Fusion GPS to help produce the dossier, which contained unverified allegations about then-GOP presidential nominee Donald Trump and saddle him with a phony scandal linking him to Russia. The payments were reported as legal expenses, obscuring the political nature of the project.In a message to a supervisor, the FBI agent said Pilger made obvious threats that the agent said were “intended to have a chilling effect and stop me from asking questions” about the Clinton and DNC funding, the Times reported.

“In my [redacted] years of being an agent, a successful agent with a great reputation, I have never been met with such suspicion or response intended to have me go away,” the FBI agent noted.

Pilger, who served as director of the Justice Department’s Election Crimes Branch, later played a significant role in authorizing the Arctic Frost investigation into former President Trump’s conduct following the 2020 election. That probe, led by then-Special Counsel Jack Smith, resulted in Trump being indicted on election-interference charges.

Cooney served as Smith’s deputy during the investigation, the Times reported.