Several U.S. lawmakers have warned against Iran's alleged support for terrorism at a hearing at the House Committee on Foreign Affairs that examined the role of the Islamic Republic in terrorism worldwide.
Ed Royce, chairman of the Committee on Foreign Affairs, said Iran's role in terrorism is often overlooked.
Royce said the Iranian regime is fomenting bloodshed in a number of countries including Afghanistan and Iraq.
"If this is what Iran is doing today without a nuclear weapon, what will Iran do if it's ever emboldened with a bomb? We cannot afford to find out," he said.
Representative Ileana Ros-Lehtinen said the U.S. administration is dealing with the nuclear talks with Tehran "as if Iran's nuclear program exists in a vacuum."
The State Department has designated Iran as a state sponsor of terrorism. Tehran denies allegations it supports terrorism.