"The Iran deal will be another issue that's coming up in May, and right now it doesn't feel like it's gonna be extended," Corker said on the CBS "Face the Nation" program.
Asked if he believed Trump would pull out on May 12, the deadline for the president to issue a new waiver to suspend Iran sanctions as part of the deal, Corker responded, "I do. I do."
Britain, France and Germany have proposed fresh EU sanctions on Iran over its ballistic missiles and its role in Syria's war, according to a confidential document, in a bid to persuade Washington to preserve the 2015 nuclear deal with Tehran.
The joint paper, seen by Reuters, was sent to European Union capitals on Friday, said two people familiar with the matter, to sound out support for such sanctions as they would need the support of all 28 EU member governments.
The proposal is part of an EU strategy to save the accord signed by world powers that curbs Tehran's ability to develop nuclear weapons, namely by showing Trump that there are other ways to counter Iranian power abroad.
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Trump delivered an ultimatum to the European signatories on January 12. It said they must agree to "fix the terrible flaws of the Iran nuclear deal" - which was sealed under his predecessor Barack Obama - or he would refuse to extend U.S. sanctions relief on Iran. U.S. sanctions will resume unless Trump issues fresh "waivers" to suspend them on May 12