Sen. John McCain John Sidney McCainThe electoral reality that the media ignores Kelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks MORE (R-Ariz.) said he has no evidence that would support President Trump’s claim that millions of people voted illegally, costing him the popular vote.

“I obviously have seen no evidence of illegal voting,” McCain told CNN on Wednesday morning. “But my focus has been on national security, getting Gen. [James] Mattis in as secretary of Defense, working with [CIA Director Mike] Pompeo, doing those issues that are national security."

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Trump on Monday told a meeting of congressional leaders that widespread voter fraud by "illegals" was the only reason he lost the popular vote to Democrat Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE.

"He said 3 to 5 million 'illegals' voted so that's why he lost popular vote," a Democratic aide told The Hill.

McCain said he had long learned not to focus on all of Trump’s statements, adding he was currently focused on the president’s Cabinet nominees.

"A long time ago, honestly, I've stopped reacting to everything that the president has stated and try to work on the issues and the people who he is going to surround himself with who I am very pleased with as far as national security is concerned,” the Senate Armed Services Committee chairman said.