A pair of top Republican senators are calling for the fullest possible level of transparency in the Justice Department’s examination of the origins of the Russia investigation, urging Attorney General William Barr to eschew how the Obama administration dealt with controversy.

Senate Finance Committee Chairman Chuck Grassley of Iowa and Homeland Security Committee Chairman Ron Johnson of Wisconsin sent a letter to Barr on Wednesday after it was revealed last week that U.S. Attorney John Durham’s administrative review of the DOJ’s and FBI’s conduct during the 2016 campaign and the first part of 2017 had become a criminal review.