Trump blames Obama for not vetting former national security adviser Michael Flynn

Trump says Flynn was already approved by the Obama administration.

In an interview with Fox News released today, the president said that Obama officials bear responsibility for the oversight -- not his own administration, which tapped Flynn for the post.

"He was approved by the Obama administration at the highest level. And when they say we didn’t vet, well, Obama, I guess, didn’t vet, because he was approved at the highest level of security by the Obama administration," Trump said. "So when he came into our administration, for a short period of time, he came in, he was already approved by the Obama administration and he had years left on that approval."

Flynn resigned from the post in February.

The Defense Department's inspector general has launched an investigation into Flynn. Documents also show that Flynn was warned against receiving payments from foreign governments without congressional approval by the Defense Intelligence Agency.

Flynn maintained a top secret security clearance even after he was pushed out of his Obama administration role at the Pentagon in 2014.

Trump also said that he was "disappointed" in how Republicans handled major issues like health care and tax reform.