Sen. John McCain John Sidney McCainKelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks Trump pulls into must-win Arizona trailing in polls MORE (R-Ariz.) said Tuesday that focusing on former national security adviser Michael Flynn’s resignation takes the focus away from other top issues, such as repealing and replacing Obamacare.

"It sucks the oxygen right out of the room. It really does," McCain said, as reported by the Washington Examiner.

"We should be talking about replacing Obamacare," McCain said. "We should be talking about tax reform — and we are talking about it, but that's not the issue that is dominating the news."

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The comments come one day after Flynn resigned from his post following reports that he misled White House officials regarding the content of discussions he had with Russia’s ambassador to the U.S. about sanctions, discussions that took place before Trump's inauguration.

In a statement released earlier Tuesday, McCain said Flynn’s resignation shows the type of “dysfunction” currently going on among White House national security officials.

"At the same time, General Flynn's resignation is a troubling indication of the dysfunction of the current national security apparatus," the senator said in the statement.

McCain reiterated this point to reporters on Tuesday.

"It’s a dysfunctional White House. ... Nobody knows who’s in charge and nobody knows who’s setting policies,” he said, according to a reporter from The Guardian.