The U.S. assassination of Iranian general Qassem Soleimani and President Donald Trump’s subsequent threat to bomb Iran’s “cultural” sites if it retaliates touched personal nerves for many members of Congress who are veterans of the Iraq War.

Soleimani headed Iran’s elite Quds Force, which is responsible for killing roughly 600 U.S. soldiers during the Iraq War mainly through unconventional tactics such as roadside bombs and other improvised explosive devices, the State Department reported last year.

Trump has said such violence should justify the U.S. targeting Iranian cultural sites, which could constitute war crimes under international law.

As Trump dug in on his position — though contradicted by his Defense secretary and secretary of State — Iraq War veteran Rep. Ruben Gallego urged that the U.S. military must follow international rules of war and uphold the country’s ideals and not stoop to the moral level of the people it’s fighting.