Apparently the Democrats have a history of doing the same sort of thing but worse when they don't have the presidency

http://thefederalist.com/2015/03/11/...n-iran-letter/

No it's not treason. It is also technically correct. Congress is the lawmaker. The executive has no lawmaking power. The executive is granted authority to make foreign policy decisions, but the laws regarding all of that authority is all congress. The slow trend of the country has been taking more power from congress and giving it to the executive. This is mainly by public perception, but politicians have also been lax. People love the simplicity of the idea of a king-figure, but that isn't the way the Constitution has it. We forget that the president isn't supposed to have that much power.

Other than that, it's debatable that Obama is doing the right thing. Unless there is a lot of information we don't have, he is a fool in his dealings with Iran. Given that the GOP has this view, right or wrong, it's sensible that they would try to use their legal authority to keep him from causing too much damage. It is absolutely clear that Iran is not interested in nuclear power for energy generation. I'm a little amazed at how naive the Obama administration is in that it thinks it can get a deal with a country that clearly wants nuclear capabilities more than anything else. The GOP senators react strongly because if a deal is cut with a country that all reasonable estimates suggest it has no desire to stick to the deal, and that country gets nuclear capabilities through that, it would be the biggest policy failure since, like, forever.

If you thought the outcome of a mishandling of Iraq 2 was bad, just wait until the arguably most geopolitically powerful enemy of the West gets a nuke.