Iran’s Arak heavy water reactor. Photo: Wikipedia.

The House of Representatives passed legislation on Wednesday to block the purchase of “heavy water” from Iran, defying President Barack Obama’s veto threat a year after the announcement of the landmark Iran nuclear agreement.

The House passed the “No 2H2O from Iran Act” by 249-176, with support coming almost exclusively from Republicans, who hold a majority of seats in the chamber.

Read full story at Reuters.