Last month, Senators Robert Menendez (D-NJ) and Mark Kirk (R-IL) introduced a sanctions bill against Iran.
About 48 senators have supported the bill, but the chairs of 10 Senate committees wrote to Senate Majority Harry Reid, criticizing the bill and asking him not to move forward with it.
The White House, however, has said President Barack Obama will veto the bill if it passes. It is still unclear whether backers can put together the two-thirds majority in the 100-member Senate needed to override a veto by Obama.
On Tuesday, Iran said the nuclear deal will collapse in case of fresh US sanctions. "Approval of any new sanctions will be tantamount to terminating the ongoing talks," Iran Foreign Ministry spokeswoman Marzieh Afkham said.
In this edition of the show we ask: why US lawmakers are discussing fresh sanctions on Tehran when negotiations are ongoing towards a final resolution over Tehran’s nuclear energy program.