Bruce's lengthy statement continued, "Prior to the United States' successful military operation, Iran was amassing a growing stockpile of highly enriched uranium for which there was no credible peaceful purpose, and it was the only state producing highly enriched uranium, up to 60%, that does not have nuclear weapons."

U.S. lawmakers consider giving Israel B-2 bombers and bunker buster bombs as Iran could restart uranium enrichment within months despite damage from recent American strikes.

President Donald Trump said early Monday he is "not offering Iran anything" despite suggesting new nuclear talks with Tehran.