Sen. John McCainJohn Sidney McCainPoll: Sinema approval higher among Arizona Republicans than Democrats Meghan McCain: COVID-19 battle made me doubt if nation will recover from pandemic Biden's year two won't be about bipartisanship  MORE (R-Ariz.) on Sunday expressed opposition to possible GOP efforts to filibuster a Senate gun-control measure, saying he did not “understand” the move to block debate.

“I don’t understand it,” said McCain on CBS’s “Face the Nation.” “The purpose of the United States Senate is to debate and to vote and to let the people know where we stand.”

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“What are we afraid of? Why would we not want… if this issue is as important as all of us think it is, why not take  it to one of the world’s greatest deliberative bodies – that’s one of the greatest exaggerations in history by the way – but you know why not take it up, an amendment and debate. The American people will profit from it,” said the Arizona senator.

“I don’t understand why United States senators want to block debate when the leaders said we could have amendments,” McCain added.

A number of GOP lawmakers, including Sens. Rand PaulRandal (Rand) Howard PaulRand Paul praises removal of Neil Young songs from Spotify: 'Seeya' YouTube permanently bans Dan Bongino Conservative pundit says YouTube blocked interview with Rand Paul MORE (Ky.), Mike LeeMichael (Mike) Shumway LeeSenate Republicans press federal authorities for information on Texas synagogue hostage-taker Put partisan politics aside — The Child Tax Credit must be renewed immediately These Senate seats are up for election in 2022 MORE (Utah), Marco RubioMarco Antonio RubioPut partisan politics aside — The Child Tax Credit must be renewed immediately These Senate seats are up for election in 2022 Lawmakers press Biden admin to send more military aid to Ukraine MORE (Fla.), and Ted CruzRafael (Ted) Edward CruzFlake meets with Erdoğan in first official duties as US ambassador Senate Republicans press federal authorities for information on Texas synagogue hostage-taker Biden trails generic Republican in new poll, would face tight race against Trump MORE (Texas) wrote to Senate Majority Leader Harry ReidHarry Mason ReidSchumer vows to vote on Biden Supreme Court pick with 'all deliberate speed' Democrats say change to filibuster just a matter of time The Hill's 12:30 Report - Presented by Connected Commerce Council - Biden faces reporters as his agenda teeters MORE (D-Nev.) vowing that they would “oppose the motion to proceed to any legislation that will serve as a vehicle for any additional gun restrictions.” 

Reid is planning to bring to the Senate floor this month legislation that would expand background checks, toughen penalties on straw purchasers of firearms and provide funding for school safety. But the background checks provisions have attracted opposition from GOP lawmakers after efforts to forge a bipartisan compromise faltered. 

The Senate vote comes as the White House is intensifying effort to pressure Congress to enact gun control, with Obama holding events with families of victims of gun violence and taking his message on the road to states which have experienced mass shootings.

Obama press secretary Jay Carney on Wednesday said it would be “shameful” for Republicans to filibuster a gun-control bill.

The Senate measure, though, is unlikely to attract support in the GOP House and Sen. Chuck GrassleyChuck GrassleySenate Republicans press federal authorities for information on Texas synagogue hostage-taker Small ranchers say Biden letting them get squeezed These Senate seats are up for election in 2022 MORE (R-Iowa) is also readying his own gun-control bill as an alternative to the Democratic proposal. 

Appearing with McCain, Sen. Charles SchumerChuck SchumerSchumer vows to vote on Biden Supreme Court pick with 'all deliberate speed' Voting rights failed in the Senate — where do we go from here? Forced deadline spurs drastic tactic in Congress MORE expressed optimism that if the bill proceeded to the floor, a measure on background checks could pass.

“If we go to the floor, I’m still hopeful that what I call the ‘sweet spot’ background checks can succeed. We are working hard there. Sen. [Joe] Manchin (D-W.Va.) and Sen. [Mark] Kirk [R-Ill.] have a few ideas that could modify the proposal.”

McCain said he would welcome a debate on background checks on the Senate floor.

“Everybody wants the same goal to keep the guns out of the hands of criminals and the mentally disabled. Background checks are being conducted. Are they sufficient, are there ways to improve those? Then I think that’s something that the American people and certainly Congress could be helped by if we have a vigorous debate and discussion,” said McCain.