CIA Director John Ratcliffe has told skeptical U.S. lawmakers that American military strikes destroyed Iran’s lone metal conversion facility and delivered a monumental setback to Tehran’s nuclear program that will take years to overcome.

CIA Director John Ratcliffe told U.S. lawmakers that recent American military strikes dealt a major blow to Iran’s nuclear program by destroying the country’s only metal conversion facility, a U.S. official told Associated Press on June 29.

Iran’s nuclear program has been “severely damaged” by last weekend’s U.S. military strikes, Central Intelligence Agency Director John Ratcliffe said, backing President Trump’s assertions about the bombings.