White House decries Republican effort to derail Iran talks

Forty-seven Republicans, including Senate leaders and several potential 2016 presidential candidates, wrote an open letter to Iran's leader, warning any deal with President Barack Obama might not be honored in future. "It raises significant questions about the intent or the aims of the authors," said spokesman Josh Earnest, who accused the senators of establishing a "back channel" with hardliners in Tehran. With a March deadline looming, negotiators are furiously working