Attorney General William Barr said the Justice Department would appeal the court’s ruling last month that tossed Dzhokhar Tsarnaev’s death sentence.

In a tweet, U.S. President Donald Trump said the federal government must challenge a July 31 appeals court decision overturning the death penalty for the 2013 attack.

Lawyers for Tsarnaev, 25, argued in a brief filed with the 1st U.S. Circuit Court of Appeals in Boston that a lower-court judge's refusal to move the case to another city not traumatized by the bombings deprived him of a fair trial.