House Democratic leaders are urging their members to oppose the stopgap spending bill Republicans plan to bring to the floor on Tuesday, according to aides and lawmakers. This raises the likelihood that the government could shut down on March 14.

Republicans in the House released a stopgap spending plan over the weekend that would delay a government shutdown for at least six months, but it's unclear if they have the votes to pass the measure.

The spending bill will provide for an increase in defense spending, a decrease in non-defense spending, and an additional $6 billion for veterans' healthcare.