Senate Majority Leader Mitch McConnell said the end-of-year spending legislation "is likely" to include a measure addressing President Obama's plan to resettle 10,000 Syrian refugees in the United States.
Senate Democrats, meanwhile, are devising their own legislation to boost national security by improving the nation's visa waiver program, said Senate Minority Leader Harry Reid, D-Nev.
The Senate has not taken up a House-passed bill that would all but halt the program by significantly boosting the screening requirements. The bill passed overwhelmingly and with 47 Democrats, raising the prospects that it has enough support to override a veto from President Obama.
McConnell suggested the measure, or some version of it, could end up in the 2016 fiscal spending legislation, known as the omnibus bill.