Chuck Grassley stated in a Senate floor address on Monday that an FBI document he saw revealing unsubstantiated claims of a confidential source revealed that a Ukrainian gas business official who allegedly bribed President Joe Biden and Hunter Biden made audio tapes of phone talks with them.

While he did not claim that the FD-1023 form revealed any of the alleged discussions between the president, his son, and the Burisma official, the senior Republican senator from Iowa said that it stated that the executive had 17 such recordings in his hands.

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House Republicans are looking into allegations of bribery and corruption against Joe Biden during his term as vice president. It has been reported that Biden advocated for the firing of Ukraine’s chief prosecutor at the time in order to protect his son, Hunter Biden, who served on the Burisma board from 2014 to 2019. Hunter Biden maintains his innocence.

According to NBC News, which cited a senior law enforcement source, the FBI and a U.S. attorney appointed by former President Donald Trump evaluated the allegations against the Bidens in 2020, but found them baseless.

While speaking to the Senate, Grassley stated that the FD-1023 document he had read revealed that “the foreign national who allegedly bribed Joe and Hunter Biden allegedly has audio recordings of his conversations with them—17 such recordings.”

Rudy Giuliani, Trump’s former lawyer, has claimed that Joe Biden supported his son with his business operations in Ukraine, which the president has rejected. Hunter Biden has stated that he and his father did not discuss his business transactions.

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According to Fox News, which has not seen the form but spoke to many sources who were aware of its contents, the secret source mentioned “the Big Guy,” who is thought to be Joe Biden, but noted that the Burisma executive “didn’t pay the Big Guy directly.”