Members of Congress may have failed to derail the international nuclear agreement with Iran outright, but they're not giving up.

When lawmakers return Sept. 16 after taking two days off for Rosh Hashanah, the Senate is expected to vote once again on a resolution of disapproval that failed to reach a 60-vote threshold this past week. House lawmakers, meanwhile, are considering a range of new non-nuclear sanctions as well as a lawsuit accusing the White House of violating the congressional review law by not turning over confidential inspection agreements between the International Atomic Energy Agency and Iran.

"My colleagues who understand the threat from Iran — including Democrats and Republicans — will continue to stand against this agreement, for the sake of our nation’s security and in defense of the free world," House Homeland Security Chairman Michael McCaul, R-Texas, said in the weekly Republican address over the weekend.

The sanctions debate is expected to heat up Sept. 17 during the Senate Banking Committee's nomination hearing for Adam Szubin, President Barack Obama's choice for undersecretary for terrorism and financial crimes at the Treasury Department. Szubin would play a key role in lifting so-called secondary sanctions that target foreign companies and nations doing business with Iran.