The US Senate has passed a bipartisan bill to allow Congress to review and potentially reject an international nuclear agreement with Iran.

The bill was approved 98-1 on  with Republican Tom Cotton being the only naysayer, as he wants a potential deal with Iran to be presented to Congress as a treaty.

Under the Senate bill, Congress will review and vote on a nuclear pact with Iran within 30 days, during which the Obama administration cannot lift sanctions on Iran. It will advance to the House of Representatives for a vote.

Iran and the US, Britain, China, France, Russia plus Germany, collectively known as the P5+1 group, are racing against the June 30 deadline for a comprehensive agreement after negotiating a framework deal in early April.