Thomas Erdbrink

Republican Senator Tom Cotton speaks at his election victory party on November 4, 2014. The freshman senator from Arkansas is emerging as a vocal opponent of nuclear negotiations with Iran.

Republicans to Iran: A nuclear deal can disappear 'with a stroke of a pen'

Republican Senator Tom Cotton of Arkansas took to Twitter on Monday to warn Iran that any nuclear deal with the US could easily be wiped out once President Barack Obama leaves office. But did he and 46 other senators step beyond their authority?

Republicans to Iran: A nuclear deal can disappear 'with a stroke of a pen'
US ships

Could the crisis in Iraq lead to cooperation between Iran and US?

Could the crisis in Iraq lead to cooperation between Iran and US?
The flag of the International Atomic Energy Agency

A nuclear deal between Iran and the western powers begins to take effect

A nuclear deal between Iran and the western powers begins to take effect
An Iranian woman walks past an anti-U.S. poster during a visit to a war museum in the city of Khorramshahr, southwest of Tehran in 2007.

In Iran, reformers must battle the 'Death to America' crowd

In Iran, reformers must battle the 'Death to America' crowd

Iran's Rouhani willing to work with the West

Iran's Rouhani willing to work with the West

As tensions rise, Iranians fear that they're on the road to war with U.S.

While Iran gives cautious signs that it's willing to consider negotiations with western nations, and the E.U. and U.S. increase the sanctions against the country in an effort to halt its nuclear ambitions, Iranians worry their country is hurtling toward war.

As tensions rise, Iranians fear that they're on the road to war with U.S.

Imprisoned American hikers in Iran to be freed

Imprisoned American hikers in Iran to be freed

Iran frees imprisoned American hikers

Iran frees imprisoned American hikers

American hikers imprisoned in Iran freed today

State Department confirms Shane Bauer and Joshua Fattal, captured by the Iranian government while hiking along the Iran-Iraq border and charged with espionage, were freed today.

American hikers imprisoned in Iran freed today