Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE (R-Ariz.) on Saturday said although he thinks President Trump has created uncertainty about the trajectory of the country's foreign policy, the United States is committed to its foreign allies.

"I realize that I come to Italy at a time when many are questioning whether America is still committed to remaining engaged in the world, to upholding our traditional alliances, and standing up for the values we share," McCain said at the America at the Ambrosetti Forum, an international economic and policy conference in Italy, according to remarks released by his office.

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"I also realize — and there is no point in avoiding a little straight talk here — that this doubt has much to do with some of the actions and statements of our president," added McCain, who has frequently criticized Trump.

While underscoring the importance of U.S. relationships with European countries — particularly Italy — the Arizona senator said there is a "real debate" taking place in the country as to what role it will play on the international stage.

"What I do believe, and I do not think I am exaggerating here, is that the future of the world will turn, to a large extent, on how this debate in America is resolved," McCain said.

This is not the first time McCain has spoken out about Trump's foreign policy.

McCain, the chairman of the Senate Armed Services Committee, previously slammed the president for causing uncertainty for longtime allies, remarking that it "unsettled America's friends" during a speech in Australia earlier this year.

The president has shaken up the country's participation in international alliances and agreements, equivocating on whether the country will continue to participate in NATO and also pulling out of the Paris climate accord earlier this year.

The Republican senator, who was diagnosed with brain cancer in July, announced this week that he will return to the Senate after its August recess ends on Tuesday.