Attorney General Merrick Garland faces his first test on federal executions as the Supreme Court considers reinstating a death sentence for the Boston Marathon bomber.

The court since October has been mulling a Trump-era federal appeal to rehear a death penalty case against Dzhokhar Tsarnaev, who, along with his brother, killed three people and injured more than 200 others at the 2013 Boston Marathon. When then-Attorney General William Barr took the case to the high court, he vowed to do “whatever’s necessary” to see Tsarnaev executed.