Sen. John McCainJohn Sidney McCainLawmakers toast Greta Van Susteren's new show Meghan McCain: It's 'breaking my heart' Warren is leading Biden in the polls The Hill's 12:30 Report: Video depicting Trump killing media, critics draws backlash 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 PaulCheney unveils Turkey sanctions legislation CNN catches heat for asking candidates about Ellen, Bush friendship at debate Overnight Defense — Presented by Boeing — Trump isolated amid Syria furor | Pompeo, Pence to visit Turkey in push for ceasefire | Turkish troops advance in Syria | Graham throws support behind Trump's sanctions MORE (Ky.), Mike LeeMichael (Mike) Shumway LeeHillicon Valley: FCC approves T-Mobile-Sprint merger | Dems wrangle over breaking up Big Tech at debate | Critics pounce as Facebook's Libra stumbles | Zuckerberg to be interviewed by Fox News | Twitter details rules for political figures' tweets Republican lawmaker proposes transferring drone authority to local governments A decade of policymaking failures is to blame for new Syria crisis MORE (Utah), Marco RubioMarco Antonio RubioChina's TikTok turns to former lawmakers to help with content moderation policies Hillicon Valley: Warren turns up heat in battle with Facebook | Instagram unveils new data privacy feature | Advocacy group seeks funding to write about Big Tech TikTok adds former lawmakers to help develop content moderation policies MORE (Fla.), and Ted CruzRafael (Ted) Edward CruzThe Hill's Morning Report - Dem debate contenders take aim at Warren The Hill's Morning Report - Trump grapples with Turkey controversy This week: Congress returns to chaotic Washington MORE (Texas) wrote to Senate Majority Leader Harry ReidHarry Mason ReidTrump thanks Reid for warning Democrats not to underestimate him Reid warns Democrats not to underestimate Trump Harry Reid predicts Trump, unlike Clinton, won't become more popular because of impeachment 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 GrassleyCharles (Chuck) Ernest GrassleyFarmers: New Trump ethanol proposal reneged on previous deal Overnight Energy: Farmers say EPA reneged on ethanol deal | EPA scrubs senators' quotes from controversial ethanol announcement | Perry unsure if he'll comply with subpoena | John Kerry criticizes lack of climate talk at debate Positive quotes from Iowa senators disappear from EPA's latest ethanol announcement MORE (R-Iowa) is also readying his own gun-control bill as an alternative to the Democratic proposal. 

Appearing with McCain, Sen. Charles SchumerCharles (Chuck) Ellis SchumerPelosi fires back after Trump 'meltdown': 'We have to pray for his health' 5 big wins in US-China trade pact Trump defends 'crime buster' Giuliani amid reported probe 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.