The latest twist in the nuclear negotiations between Iran and the US sees group of Republican members of Congress send an open letter to Iran to warn them over the potential deal, Bloomberg reports. The letter was instigated by Senator Tom Cotton and has been signed by every member of the Republican leadership within Congress and a number of 2016 Presidential hopefuls. The letter comes as politicians from both sides of the political divide have voiced concerns over the potential deal taking place without Congressional agreement.

According to AnastasiaDate, the Obama Administration has been negotiating with Iran’s leadership in recent months in a bid to come to agreement over the development and stockpiling of nuclear weapons. The letter from Republicans explains how any deal not rubber stamped by the US Congress will be little more than an agreement in principle, which could be removed by the incoming President in 2016 or by order of Congress. The same issues have also been highlighted by Iranian leader, Ayatollah Ali Khamenei, who has expressed public doubts about the possible deal between the US and Iran.