Senate Intelligence Committee Chairman Dianne Feinstein (D-Calif.) said she believes the attacks Monday afternoon in Boston constitute a terrorist attack.
Senator is a longtime advocate for overhauling the War Powers Act.
The measure would provide most, but not all of the funding President Obama is seeking to deal with the influx of migrants from Central America.
Several big issues -- veterans' health care, highway construction funding and how to deal with the U.S.-Mexico border -- remain unresolved with just hours to go until recess.
The Senate leader once again blames Republicans for stalling measures to help the VA and deal with influx of child migrants.
Potential debate comes 15 months after gun rights legislation stalled on Capitol Hill.
Most states get about half of their transportation money from the federal government and the pot of money is expected to run dry by Aug. 1.
Decision is a major blow for President Obama and congressional Democrats, who championed the most significant gay rights legislation passed in years.
GOP lawmakers use opportunity to again sharply criticize President Obama.
A look at how momentum for the issue built, then fell fast.
Once again Democrats and Republicans are fighting over the rules, possibly upending carefully-orchestrated plans to avoid another government shutdown.