The U.S. Justice Department’s plan to restart federal executions using a single lethal-injection drug may get quick scrutiny in a lawsuit pending in Washington’s federal district court since 2005.

U.S. Attorney General William Barr on Thursday ordered the Bureau of Prisons to set execution dates for five federal death row inmates. At the same time, the Justice Department announced it was replacing its prior three-drug lethal injection protocol with a single drug: pentobarbital.