During a speech on the U.S. Senate floor today, U.S. Senator Roy Blunt (Mo.) raised concerns over the lack of U.S. influence in the ongoing Iranian nuclear negotiations. Blunt also reiterated his calls for the Obama Administration to cease all negotiations until the American hostages detained in Iran are released, including Pastor Saeed Abedini, former U.S. Marine Amir Hekmati, and Washington Post journalist Jason Rezaian, and until Iran cooperates with the U.S. in locating former FBI official Robert Levinson.