Yes, he can? Nope. He probably won't. For Al-Qaida he has grown balls. Sort of. For Iran he hasn't. One year or more, Congress is right. Can Obama grow balls faster than the centrifugess spin in Iran, and the weaponization program gets its final touches ready. It reminds the nazis' V2 at Peenemuende.
U.S. asks Uzbekistan to join anti-ISIS coalition (Reuters)
from the article: U.S. Congress urges Obama to impose 'crippling sanctions' on Iran