Sen. Elizabeth Warren is doubling down on her claims to Native American ancestry — and on her outrage.

She recently pointed to the Oval Office portrait of President Andrew Jackson as “offensive” because it honors “a man who did his best to wipe out Native people.”

Funny: Just three years ago, Warren was the keynote speaker at a 2015 Jefferson-Jackson Day dinner, such events being commonplace for the party that Jackson founded.

The blond-haired, blue-eyed Massachusetts Democrat seems to think that going on the offensive is her best strategy for answering President Trump’s “Pocahontas” taunts, which refer to the “Fauxcahontas” charges she’s faced since her first run for the Senate.

Her problem is that she first started publicly presenting herself as Native American back when her academic career had stalled — and seemed to benefit from the claim of minority status when she wound up becoming Harvard Law School’s first tenured “Indian” professor.

That has left regular Native American groups eyeing her suspiciously; in response, she’s now trying to pick up their agenda — while regularly citing family legends to justify the identification.

Of course, she could resolve the issue permanently by simply getting her DNA analyzed. How about it, Liz?