Hillary Clinton says she’s “still” not over the 2016 election, and she showed it Sunday during a speech at Yale — cracking a joke about Kremlin interference and busting out a large Russian hat to boot.

“If you can’t beat them, join them,” Clinton quipped.

The jab came during her commencement speech at Yale’s Class Day.

Keeping up with the university’s longstanding tradition of bringing an “over the top hat” to the ceremony, Clinton pulled out a black Ushanka and playfully went to put it on.

“I see looking out at you that you are following the tradition of over-the-top hats. So I brought a hat, too,” she said. “A Russian hat.”

Clinton — who graduated from Yale’s law school in 1973 — took a more serious tone, though, when talking to graduates about her loss to President Trump.

“No, I’m not over it,” she said. “I still think about the 2016 election, I still regret the mistakes I made.”

While Clinton feels “okay” as a person, she said she’s “concerned” as an American.

“This is a moment to reach across divides of race, class, and politics to try to see the world through the eyes of people very different from ourselves and to return to rational debate,” Clinton explained, calling this “one of the most tumultuous times” for our country.

“It’s not easy to wade back into the fight every day,” she added. “I’m optimistic just how tough America has proven to be.”

With Post wires