Sarah Palin and Mehdi Hasan were at each other’s throats during a panel discussion on Piers Morgan‘s show … and the former Veep candidate got branded a racist.

Ya gotta see the video … Sarah and Mehdi, a British-American journalist, start going back and forth over Donald Trump and Joe Biden when things get nasty.

Sarah calls Mehdi an “obnoxious a**” when he keeps hounding her for facts and figures about energy production under Trump and Biden … and then it gets racial.

Mehdi accuses Sarah of being a racist and says he’s got receipts to back it up … rattling off a list of nasty things she said about Barack Obama back in the day.

Sarah takes offense and denies the assertion but Mehdi keeps going … really setting Sarah off when he claimed she once referred to Black Lives Matter protesters as “dogs.”

It all went down today on the latest episode of “Piers Morgan Uncensored” … and even Piers wasn’t able to reign them in.