(DEVELOPING STORY) – President Joe Biden today implored the Senate to pass new gun control measures in the wake of a mass shooting that left 10 dead in Boulder, Colorado yesterday.

Biden said he didn’t “want to wait another minute, let alone an hour,” to act on gun violence.

He urged the House and Senate to ban assault weapons.

He also called on the Senate to pass two House bills that closed loopholes on background checks, including the Charleston loophole.

The House passed an expansion of gun background checks in March. The two bills expand federal gun background checks on all firearms sales and extend the background check review period from three days to a minimum of 10 business days. One bill would close the “Charleston loophole,” where a gun sale is allowed to proceed if the background check is not completed in three days.

According to police, 21-year-old Ahmad Al Aliwi Alissa opened fire at a grocery store on Monday, leaving nine civilians and one police officer dead in the wake.

Officials said they are still working to determine a motive in the shooting.

Monday’s mid-afternoon attack was the seventh mass killing this year in the U.S., following the March 16 shooting that left eight people dead at three Atlanta-area massage businesses.

Senate Majority Leader Chuck Schumer said today the Senate will specifically move to expand gun background checks — an effort that has long evaded passage in the upper chamber.

“We cannot seem to finish grieving one tragedy before another takes place,” Schumer said, detailing the back-to-back Atlanta and Boulder mass shootings. “It is a reminder that we must confront a devastating truth in the United States: an unrelenting epidemic of gun violence steals innocent lives with alarming regularity.