Extending U.S. sanctions on Iran for 10 years would breach the Iranian nuclear agreement, Iran Supreme Leader Ayatollah Khamenei said on Wednesday, warning that Tehran would retaliate if the sanctions are approved.

"The current U.S. government has breached the nuclear deal in many occasions," Khamenei said, addressing a gathering of members of the Revolutionary Guards, according to his website.

"The latest is extension of sanctions for 10 years, that if it happens, would surely be against JCPOA, and the Islamic Republic would definitely react to it."

The U.S. House of Representatives voted this month for legislation to extend American sanctions on Iran for 10 years. The legislation needs Senate approval and President Obama's signature.