program resumed in switzerland on monday. the u.s. secretary of state met with the iranian foreign minister for five hours. no agreement of reached. and jim accosta reports there s another factor in negotiations. reporter: while iranian and u.s. official try make progress in their nuclear negotiations the talks in switzerland hit a speed bump in the form of a letter written by senator tom cotton and signed by 46 of his republican colleagues to iran s ruling clerics complaining about the nuclear talks. the obama administration says tear ran s negotiators raised cotton s letter with u.s. officials. i m embarrassed for them. it s not how america does business. reporter: in a newly released excerpt from his interview advice the president blasted cotton. for them to address a letter to the ayatollah, the supreme