FILE - White House national security adviser Jake Sullivan speaks during the daily briefing at the White House in Washington, May 22, 2024. Sullivan and Secretary of State Antony Blinken said Friday, July 19, at separate panels in Colorado, that Iran is talking more about getting a nuclear bomb, and has made strides in developing one key aspect of a weapon in recent months. Sullivan says he has seen no sign Iran has decided to actually weaponize its nuclear program. Blinken says Iran recently has stepped up work on fissile material to fuel a bomb. (AP Photo/Susan Walsh, File)
FILE - Iranian Supreme Leader Ayatollah Ali Khamenei speaks in Tehran, Iran, July 5, 2024. Secretary of State Antony Blinken and national security adviser Jake Sullivan said Friday, July 19, at separate panels in Colorado, that Iran is talking more about getting a nuclear bomb, and has made strides in developing one key aspect of a weapon in recent months. Iran says its nuclear program is for civilian purposes. The U.S. and others in the international community believe Khamenei long has held off from giving any final go-ahead for Iranian scientists to develop a nuclear weapon. (AP Photo/Vahid Salemi, File)
FILE - Secretary of State Antony Blinken speaks to the press in Washington, July 17, 2024. Secretary of State Antony Blinken and national security adviser Jake Sullivan said Friday, July 19, at separate panels in Colorado, that Iran is talking more about getting a nuclear bomb, and has made strides in developing one key aspect of a weapon in recent months. Sullivan says he has seen no sign Iran has decided to actually weaponize its nuclear program. Blinken says Iran recently has stepped up work on fissile material to fuel a bomb. (AP Photo/Jose Luis Magana, File)