Sen. Chuck Grassley (R-IA), who has been leading an investigation into Hunter Biden, was not satisfied after federal prosecutors unveiled a plea agreement with the president’s son related to tax crimes and the purchase of a handgun.

Grassley vowed to continue his investigation.

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Biden, 53, will plead guilty to two misdemeanor tax evasion charges and one firearms offense, according to a court filing in Delaware on Tuesday.

The charges immediately sparked accusations of a “double standard” by congressional Republicans, such as Grassley, who are pursuing investigations into the business dealings of Hunter Biden and are pursuing claims about an influence-peddling operation.

“Today’s plea deal cannot be the final word given the significant body of evidence that the FBI and Justice Department has at its disposal. It certainly won’t be for me,” the senator said in a statement on Tuesday.

The Iowa Republican also accused the Department of Justice of failing to act on other information regarding criminal conduct that involved other Biden family members.

“Whistleblowers at the Justice Department and IRS have warned that the FBI and Justice Department have sat on additional verifiable information about criminal conduct that involves other Biden family members and have failed to follow normal investigative procedures to run that information to ground,” Grassley said. “All of this information has been provided to the Department.”

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Grassley continues to pursue a theory alleging a criminal bribery scheme between then-Vice President Joe Biden, his son Hunter Biden, and a Burisma executive. The Iowan made a claim on the Senate floor last week that the executive who paid $5 million maintained audio recordings of calls with the family as an “insurance policy.” The claims have not yet been verified.

Burisma became a hot-button topic when then-President Donald Trump referenced it in a July 2019 call with Ukrainian President Volodymyr Zelensky. The call spurred a whistleblower complaint, which sparked Democratic-led impeachment proceedings in the House against Trump and an acquittal in the Senate.