Iran's currency hit a record low Monday as Washington prepared to announce new sanctions it said would add further pressure on an economy already battered by previous sanctions and a U.S. naval blockade.

Iran's currency hit a record low Monday as Washington prepared to announce new sanctions it said would add further pressure on an economy already battered by previous sanctions and a U.S. naval blockade.

The new head of Iran's top security body warned Sunday that Tehran will see any country's support for new U.S. economic measures against the Islamic Republic as an "act of war," while Iran's president defended a memorandum of understanding with the U.S. as the best way out of the stalled conflict.

President Donald Trump said he has presided over "the essential denuclearization of Iran." But Iran likely still has materials and machinery that can be used to make nuclear weapons, undercutting Trump's claim.