Two top State Department negotiators are set to talk with Iranian officials about Tehran's nuclear program in Geneva early next week.
Deputy Secretary of State William Burns and Undersecretary of State for Political Affairs Wendy Sherman will hold talks on Monday and Tuesday, weeks ahead of a July 20 deadline to solidify a deal.
Republican lawmakers, especially potential 2016 presidential contenders, have blasted the Obama Administration for weakening U.S. foreign policy by negotiating with Iran.
Hillary ClintonHillary Rodham ClintonEx-Clinton aide calls Trump spokesman a 'failure' Madonna to critics of women's march: 'F--k you' Women's march takes over DC MORE, widely considered the frontrunner for the 2016 Democratic nomination, has voiced skepticism that negotiations will work.
"Now President Obama has said that the odds of getting a comprehensive agreement are 50-50. I personally am skeptical that the Iranians will follow through and deliver," she said to the American Jewish Committee's global forum in Washington last month.
"I've seen many false hopes dashed over the years, but nonetheless this is a promising development and we need to test it to see what can be achieved," she added.