A top surrogate for Bernie Sanders isn’t impressed by Sen. Elizabeth Warren’s attacks against Donald Trump, whom she frequently needles on Twitter and slams in speeches.

Nina Turner said she didn’t think Warren could woo Sanders supporters if Hillary Clinton chose her as running mate, saying the Massachusetts senator hadn’t done enough to help her colleague from Vermont during his primary campaign, reported The Hill.

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“It’s easy for Democrats to attack Mr. Trump,” said Nina Turner, the former state senator from Ohio. “You don’t get any brownie points from me and other progressives for getting into a Twitter war with Mr. Donald Trump. That’s easy. But when the fight was hard for Sen. Bernie Sanders, where was Sen. Warren?”

Turner said she and other Sanders supporters were disappointed that Warren, as one of the most high-profile progressive lawmakers, didn’t campaign for the Democratic challenger.

“They’re gonna attack me for saying this, but I’m a truth-teller at this point,” Turner said.

Warren announced Thursday night that she would endorse Clinton for president.