Nuclear program of Iran
The meeting with the leaders of Germany, France, and Britain — known as the E3 — comes at a pivotal time, as Iran continues to enrich uranium to near-weapons-grade levels.
The scientist, Mohsen Fakhrizadeh, was thought to have led the program in the early 2000s.
The Natanz nuclear site is one of the most-tightly guarded sites in all of Iran.
The senator from New Jersey said he would try to craft a new agreement to address international concerns over the Islamic Republic's nuclear capability.
The move puts the future of the 2015 international agreement in crisis.
Senate Foreign Relations Committee chair Bob Corker hopes Europeans agree to tweak the accord ahead of a May 12 deadline that Trump could use to kill it.
Most Americans know nothing about how Iranians practice Islam, and that ignorance breeds fear.
The move means the Iran nuclear deal remains in place, for now.
The move would effectively end a 2015 deal to limit Tehran’s nuclear ambitions.
Tens of thousands of Iranians have demonstrated across the country since Thursday.