Senate Intelligence Committee Chairman Dianne Feinstein (D-Calif.) said she believes the attacks Monday afternoon in Boston constitute a terrorist attack.
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.
Sen. John Walsh (D-Mont.) says the personal and financial costs of sending troops back would be too great and that Iraqis need to defend their own country.
Senate leader intensifies the political rhetoric surrounding the deteriorating security situation in Iraq by singling out GOP critics of Obama's Iraq policy.
Meeting will come as White House weighs potential military options to address deteriorating crisis.