As talks on a comprehensive Iran nuclear deal are set to get underway in Vienna next week, over 100 members of Congress have written President Obama expressing support for robust diplomacy as the best way to resolve concerns about Iran's nuclear program, and urging against any Congressional action that might interfere in sensitive negotiations.

The letter, signed by 100 Democratic House members and 4 Republicans, signals opposition to any form of Congressional resolution or legislation that could interfere with Iran diplomacy at this time, Rep. David Price (D-North Carolina) said in an interview Wednesday.

"We heard lots of talk about a possible resolution, partisan or bipartisan, that might state certain expectations for the ultimate outcome [of a comprehensive Iran nuclear deal] or otherwise interject itself into" the process, Price told Al-Monitor. "That did not seem to us a good idea."

The letter expresses opposition to "any kind of Congressional action that might empower the hardliners on the other side, raise doubts about American intentions,...almost irrespective of the content of the resolution," he said.