My question is why was the deal was wanted so much?

Former Official: Obama Admin ‘Systematically Disbanded’ Units Investigating Iran’s Terrorism Financing Networks

By: Susan Crabtree Source: Washington Free Beacon

"The Obama administration "systematically disbanded" law enforcement investigative units across the federal government focused on disrupting Iranian, Syrian, and Venezuelan terrorism financing networks out of concern the work could cause friction with Iranian officials and scuttle the nuclear deal with Iran, according to a former U.S. official who spent decades dismantling terrorist financial networks.

David Asher, who previously served as an adviser to Gen. John Allen at the Defense and State Departments, told the House Foreign Affairs Committee Thursday that top officials across several key law enforcement and intelligence agencies in the Obama administration "systematically disbanded" law enforcement activities targeting the terrorism financing operations of Iran, Hezbollah, and Venezuela in the lead-up to and during the nuclear negotiations with Tehran. ..."

".....Asher also recalled a similar scenario during the Bush administration when it stripped the Justice Department of its authorities to indict the government of North Korea in order not to derail the proposed North Korea nuclear deal.

"I think this is a bipartisan syndrome—this is not blame the Obama administration, blame the Bush administration," he said. "There's something about people wanting a deal at any cost."

http://freebeacon.com/national-security/obama-admin-systematically-disbanded-units-investigating-irans-terrorism-networks