Dem: Republicans 'lying through their teeth' about ending Iran deal
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Sen. Chris MurphyChristopher (Chris) Scott MurphySweeping election reform bill faces Senate buzz saw Kabul attack spurs fears over fate of Afghan women as US exits Sen. Murphy calls for Yemen's Houthis to accept ceasefire following trip to Middle East MORE (D-Conn.) suggested the Republican presidential field wouldn't go back on the Iranian nuclear deal if they win the White House, despite widespread opposition. 
 
"I just do not believe that any of these Republican candidates are sincere. I think they are absolutely lying through their teeth when they say they are going to rip up this agreement," he said at a Council on Foreign Relations event in New York Friday. 
 
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"Marco Rubio knows better. He is not going to rip up this deal when he becomes president and he knows it," he said. 
 
The international community reached "implementation day" on the Iran deal earlier this month, a milestone that prompted the Obama administration to lift sanctions against the country. 
 
The Iran deal has been repeatedly and widely disavowed among the 2016 GOP presidential field, with Republicans pledging to dismantle the agreement — along with other key pillars of Obama's foreign policy — if they are elected to the White House. 
 
Rubio doubled down on that pledge during this week's Republican debate, saying that "when I am president of the United States, on my first day in office, we are canceling the deal with Iran." 
 
"Nations will have to make a choice" between the United States and Iran, he added. "I am very confident they're going to choose America before they choose the Iranian economy."
 
The Florida Republican has also said that, if elected president, he would ask Congress to reauthorize and strengthen existing sanctions. 
 
Murphy was also asked to weigh in on Sen. Ted CruzRafael (Ted) Edward CruzSenate panel deadlocks over Biden pick to lead DOJ civil rights division Yang: Those who thought tweet in support of Israel was 'overly simplistic' are correct CNN asks Carol Baskin to comment on loose Texas tiger MORE's friction with Senate colleagues, and the perceived "hostility" from other Republicans toward the Texas senator, who is running for president. 
 
"His rhetoric sounds demagogue-ish in a way that we haven't seen in the Senate in a long time," he said. "I think there is a high level of discomfort from both sides in terms of the way in which he is willing to use his rhetoric to oversimplify big, complex problems."