US Senate top democrat, Sen. Ben Cardin (D-Md.) the ranking member on the Foreign Relations Committee said Wednesday that it’s likely the Senate will extend Iran sanctions by the end of the year.
“I think it is likely that we can pass the Iran Sanctions Act [extension] in the lame duck,” he said. “

Lawmakers in both parties want to extend the Iran Sanctions Act (ISA), which is set to expire at the end of the year, but proposals have widely varied. Top Democrats, including Cardin, have backed a “clean,” standalone extension.
They’ll likely need 67 votes to pass a bill with Majority Leader Mitch McConnell (R-Ky.) warning that any Iran proposal would have to be able to overcome a potential veto before he would give it floor time. 
Republicans have homed in on the nuclear agreement as they try to make national security a key issue in the 2016 election. 
A Gallup poll released earlier this year found that 30 percent of Americans — but only 9 percent of Republicans — approved of the nuclear deal, under which Iran curbed its nuclear program in exchange for sanctions relief.

Source: Hill, 22 Sep. 2016