House lawmakers renewed their effort to curb the violence in the Syrian civil war, passing legislation Wednesday that would put a crimp in Russian and Iranian efforts to support Syrian President Bashar Assad’s regime.

“If you do business with Assad, the blood of the Syrian people is on your hands, and you’re going to get caught up in these sanctions,” New York Rep. Eliot Engel, the top Democrat on the House Foreign Affairs Committee and author of the bill, said on the House floor.