The federal government will resume executing death row inmates after nearly two decades without doing so, the Department of Justice announced Thursday.

Attorney General William Barr directed the Bureau of Prisons to schedule the executions of five inmates convicted of murder and other crimes. The executions have been scheduled for December 2019 and January 2020.

The department also announced a new execution protocol, replacing the three-drug cocktail previously used in federal executions with the single drug, pentobarbital.

The last federal execution was carried out in 2003. There are 62 individuals on federal death row, according to a tracker maintained by the Death Penalty Information Center.

The Supreme Court outlawed state and federal death penalty laws in the 1972 decision Furman v. Georgia. The ruling invalidated the laws then on the books, but did not outlaw the death penalty under all circumstances, leading states and the federal government to draft new legislation.

The federal death penalty was reinstated in 1988, and expanded by Congress in 1994. No federal executions took place, however, until 2001, according to to the Bureau of Prisons website.

"Congress has expressly authorized the death penalty through legislation adopted by the people's representatives in both houses of Congress and signed by the President," Barr said in a statement. "Under Administrations of both parties, the Department of Justice has sought the death penalty against the worst criminals, including these five murderers, each of whom was convicted by a jury of his peers after a full and fair proceeding."