Reid criticized a group of Senate Republicans, lead by Sens. Mike LeeMike LeeCruz offers bill to weaken labor board's power Overnight Finance: GOP offers measure to repeal arbitration rule | Feds fine Exxon M for Russian sanctions violations | Senate panel sticks with 2017 funding levels for budget | Trump tax nominee advances | Trump unveils first reg agenda The Memo: Trump tries to bend Congress to his will MORE (R-Utah) and Ted CruzTed CruzEx-CBO directors defend against GOP attacks on ObamaCare analysis Cruz: GOP will 'look like fools' if ObamaCare isn’t repealed The GOP Wonder Women who saved healthcare for 22 million MORE (R-Texas), for sending him a letter warning that they would filibuster any attempt to bring gun-control measures to the floor.

“There is simply no reason for this blatant obstruction except the fear of considering anti-violence proposals in full, public view,” Reid said.

After his comments on the Senate floor Monday, Reid filed a motion to proceed to S. 649, the Senate Democrats’ gun-control bill.

The Senate is scheduled to begin debate of gun-control legislation this week — nearly four months after a mass shooting in Newtown, Conn., where 20 first-graders were killed along with six school employees. 

The Senate bill would expand background checks on firearm purchases, create new penalties on straw purchases and include new funding for school security. It doesn’t include an assault weapons ban or limits on magazine clip capacity — although Reid promised to allow a vote on those provisions as an amendment.

Republicans have expressed concern that extending background checks could create a federal registry of gun owners and make it harder for family members to transfer firearms. Sen. Charles GrassleyChuck GrassleyTrump Jr., Manafort reach deal to avoid public hearing next week Senate panel subpoenas co-founder of firm tied to controversial Trump dossier Trump Jr., Manafort still haven't agreed to testify before Senate panel MORE (R-Iowa) said he’d introduce his own gun violence bill as an alternative.

Reid said that 90 percent of Americans support the Democrats’ plan to increase background checks for gun purchases.

"The legislation on the floor would keep guns out of the hands of convicted criminals and safeguard the most vulnerable Americans — our children," Reid said. "This proposal is supported by nine out of 10 Americans. If Republicans disagree with the measure, they are free to vote against it."

President Obama has launched a public effort to rally support for gun control, visiting states that have enacted tougher laws and speaking with families of victims of gun violence.