Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE on Friday morning weighed in on the controversy over ousted national security adviser Michael Flynn, saying that sometimes “you don’t catch everything” when vetting government officials.

Flynn was warned by the Pentagon against accepting foreign payments following his retirement from the military in 2014, according to House Oversight Committee documents out Thursday, but he did so anyway — possibly breaking the law.

Sessions said he's "comfortable" with the National Security Agency "working hard to do vetting," but it's possible payments to Flynn from Russian companies and the Turkish government may have slipped through the cracks.

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“It’s obvious that oftentimes you don’t catch everything. There might be a problem. Maybe there’s an explanation for it. I don’t know the facts of this case," the attorney general said on ABC's "Good Morning America."

Sessions added that he would not be involved with investigating discrepancies in Flynn’s background.

“I’m not involved in that investigation and wouldn’t participate in it and don’t know anything about it,” he said. “I don’t expect to.”

“They’ll do their responsibility, whatever that is,” Sessions added of the Justice Department.

The controversy over Flynn comes amid ongoing investigations into Russian meddling in the 2016 presidential election, as well as any possible coordination with President Trump campaign officials.

The Defense Intelligence Agency’s (DIA) inspector general launched an investigation into Flynn’s actions this month.

The DIA advised Flynn in a 2014 letter that it is illegal for former military officers to accept payment from a foreign government without prior approval.

“Accordingly, if you are ever in a position where you would receive an emolument from a foreign government or from an entity that might be controlled by a foreign government, be sure to obtain advance approval from the Army prior to acceptance,” Flynn was told.