The 1996 War Crimes Act punishes any “grave breach” of the Geneva conventions, including “torture."

"Trump told ABC News Wednesday that he asked “people at the highest levels of intelligence” whether torture works. “I asked them the question, “Does it work? Does torture work,” said Trump. “And the answer was, “Yes, absolutely.” "The 1996 War Crimes Act punishes any “grave breach” of the Geneva conventions, including “torture.” The 1994 U.S. anti-torture statute says that someone who “commits or attempts to commit torture” can be punished by a 20-year prison sentence. And the UN Convention Against Torture, which the U.S. ratified in 1994, says “no exceptional circumstances whatsoever … may be invoked as a justification of torture.” The charter for the International Criminal Court calls it a “crime against humanity” when conducted on civilians, and a “war crime” in the context of war."