U.S. Sen. Ted Cruz, R-Texas, and Sen. Pat Toomey, R-Pennsylvania, have filed an amendment (#1152) to the Iran Nuclear Agreement Review Act of 2015, which would require affirmative Congressional approval of any Iranian nuclear deal before sanctions relief can occur.
As currently written, the Iran Nuclear Agreement Review Act of 2015 would first require Congress to pass a resolution of disapproval and then require Congress to muster votes from two-thirds of each chamber to override a Presidential veto. What's more, if Congress failed to act within a set timeframe, the deal would go into effect by default. This process gets the Constitution's allocation of authority precisely backwards.
The Cruz-Toomey amendment would remove these options and restore a more proper process for Congress to exercise its Constitutional power. It would require President Obama to persuade a majority of Senators and Representatives to approve his deal before it goes into effect.
Hat tip: BadBlue News.