Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) took a jab at Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.) on Sunday, saying he was "not so sure" about McCain's remarks on Saturday that a majority of Americans favor free trade.

"I'm not so sure John's right about where America is on trade," Graham told ABC's George Stephanopoulos on "This Week."

.@LindseyGrahamSC says he's "not so sure" @SenJohnMcCain is right that a majority of Americans support free trade, globalization: "There's a movement all over the world to look inward, not outward, and I think it's a mistake." pic.twitter.com/nAzbDZmWC0 — This Week (@ThisWeekABC) June 10, 2018

"The [Sen.] Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE [I-Vt.] element of the Democratic Party doesn't stand for free trade. Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE said she would get out of the Trans-Pacific Partnership if she had become president. There is a movement in our party that Trump's seized that got him the nomination, and eventually became president of the United States," Graham continued. "So I'm not so sure a majority of Americans believe that globalization and free trade is in our interests," he continued.

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"I believe that. John McCain believes it, but the reason we're having these problems here at home, Brexit, Italy, there's a movement all over to look inward not outward and I think it's a mistake, but I'm not sure most Americans agree with John McCain and Lindsey Graham."

Graham's comments come after McCain took to Twitter Saturday night to slam President Trump for his threat to slap new tariffs on Canada and his decision to pull his endorsement of a joint communique signed with other Group of Seven (G-7) members at this weekend's summit in Canada.

"To our allies: bipartisan majorities of Americans remain pro-free trade, pro-globalization & supportive of alliances based on 70 years of shared values. Americans stand with you, even if our president doesn’t," McCain said.

To our allies: bipartisan majorities of Americans remain pro-free trade, pro-globalization & supportive of alliances based on 70 years of shared values. Americans stand with you, even if our president doesn’t. — John McCain (@SenJohnMcCain) June 9, 2018

McCain was responding to a pair of tweets the president sent earlier Saturday while he was en route to Singapore for a summit with North Korean leader Kim Jong Un.

"Based on Justin’s false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market!" Trump said in a tweet.

Trudeau had announced just hours earlier that all seven nations at the G-7 summit had signed on to the joint statement.

Trudeau's office responded to Trump on Saturday, saying the prime minister had been consistent with the U.S. leader.

"The Prime Minister said nothing he hasn’t said before — both in public, and in private conversations with the President," the Prime Minister's Office said in a statement.