Tired of President Obama's cautious approach, lawmakers look to sanction the two regimes.
He dismisses Ahmadinejad's accusation that US meddled in Iranian politics and must apologize.
If the mass protests in Iran succeed in bringing about change, it could produce a better neighbor – but also set a dangerous precedent for oppressive regimes.
If US president is too supportive of protests, he turns them into a 'Western plot,' say analysts.
Protesters reported beatings and shootings near the parliament Wednesday. Regime opponents vowed to persist with protests that have deepened a cultural divide between hard-liners and more moderate reformers.
The president responded to critics who accused him of not condemning Iran's crackdown of pro-democracy protesters. But he also kept his options open.
Web and social media are helping protesters, but government censors are catching up.
The president's ties to military and security forces, as well as his hardline foreign policy, are among the factors cited for his support from the country's supreme leader.