Earlier this year, I joined 366 of my colleagues in Congress to express grave concern about the Obama administration's negotiations with Iran on a possible nuclear deal. My concerns included constraining Iran's research and development capabilities as well as nuclear infrastructure. Given Iran's long record of deception, I also expressed concern about trusting Iran to comply with terms of an agreement. The most important consideration of any agreement is providing for the long-term security of the U.S. and our allies in the region by preventing Iran from making progress on producing a nuclear weapon. The more I learn about the details of this deal, the more concern I have that this is a bad deal for our security and the security of our allies in the region.