Republican U.S. Sen. Ron Johnson is asking the U.S. Department of Justice to investigate allegations made by a former attorney for President Donald Trump in Wisconsin that a judge overseeing his felony case is guilty of misconduct and must step aside.

A Wisconsin judge on Tuesday refused to step aside as requested by President Donald Trump’s former attorney who faces felony forgery case related to the 2020 election in the battleground state.

President Donald Trump’s former attorney in battleground Wisconsin is alleging that a judge presiding over his case and that of two other Trump aides charged with felonies related to the 2020 election is guilty of misconduct and must step aside.