GOP Sen. Ron Johnson is proposing a congressional commission to investigate allegations of corruption in federal law enforcement agencies, similar to the 1975 Church Committee.

The Wisconsin lawmaker said Sunday on the Fox News Channel that President Biden’s son Hunter Biden has been involved in questionable business dealings for “quite some time” and that the FBI is “sitting on a mountain of evidence” related to the matter.

Johnson, who’s in a tight reelection bid, also said a whistleblower said the FBI had the president’s son’s infamous laptop, which allegedly includes information about the business dealings, in December 2019, but agents decided to not act on it before the 2020 election, in which then-Democrat presidential nominee defeated incumbent GOP President Donald Trump.