Obama's Gun-Control Home Stretch: 'This Is Not About Me'

The Nevada Democrat said there is "no reason" for their "blatant obstruction" except the "fear of considering anti-violence proposals" in public view.

"Yet now many Senate Republicans seem afraid to even engage in this debate. Shame on them," he added.

According to the majority leader's calendar, the gun bill is expected to come up for debate on Tuesday morning.

“While nobody knows yet what Senator Reid’s plan is for the gun bill, if he chooses to file cloture on the motion to proceed to the Reid Bill (S. 649), Senator McConnell will oppose cloture on proceeding to that bill,” said Sen. McConnell spokesman John Ashbrook.

"The least Republicans owe the parents of 20 children murdered with guns at Sandy Hook Elementary is a thoughtful debate about whether stronger gun laws could have saved their little girls and boys. The least Republicans owe them is a vote," argued Reid.

Vice President Joe Biden and Attorney General Eric Holder are speaking about gun control during an event on Tuesday at the White House with law enforcement officials from around the nation.