Congressional Republicans seem to be doing their best to stop, or at least interfere with the negotiations with Iran (to keep them from developing nuclear weapons). And several Republicans have already called for military action against Iran (in spite of the fact that we are already involved in wars in two other countries -- Afghanistan and Iraq). They seem to think we could achieve an easy victory by attacking Iran. Obviously, they have learned nothing from our other engagements in that part of the world.
Fortunately, the American people are smarter than congressional Republicans. They know we have no business starting a third war -- especially since it has become obvious that we cannot win the conflicts we are already engaged in, but just seem to be creating new enemies for this country. When asked if they would prefer a military intervention or a negotiated settlement in Iran, an overwhelming majority (77% to 13%) said they wanted a negotiated settlement. They don't want a new war (and that includes the Republican base).
President Obama and Secretary of State Kerry have successfully negotiated a preliminary settlement with Iran, and the process of putting that into writing is now happening. Unfortunately, most of the congressional Republicans (and too many Democrats) think that settlement is not enough, and they are trying to stop it. But that is also contrary to the will of the general public in this country. Note in the chart below that a significant majority (58% to 33%) support the President's negotiated agreement.
These charts are from a recent Quinnipiac University Poll -- done between April 16th and 21st of a random national sample of 1,353 registered voters, with a margin of error of 2.7 points.