The testimony will occur at the end of March and it will likely be closely watched by Democrats and Republicans alike.
Judiciary Committee Chairman Jerold Nadler (D-NY) confirmed Barr's scheduled testimony in a letter signed by 23 Committee Democrats and sent to the attorney general on Wednesday.
"In your tenure as Attorney General, you have engaged in a pattern of conduct in legal matters relating to the President that raises significant concerns for this Committee," the letter declares. "In the past week alone, you have taken steps that raise grave questions about your leadership of the Department of Justice."
The letter cites complaints regarding Rudy Guiliani's "process" of feeding the Department of Justice information "about the President's political rivals," the reduced sentencing recommendation for Roger Stone and the removal of U.S. Attorney Jessie Liu who oversaw the prosecution of Stone, Rick Gates and Michael Flynn.
"These are not the only issues that our Committee intends to discuss with you when you appear," the letter warns, "but they are enough to require our immediate attention."