Democratic front-runner Hillary Clinton drew the anger of Native Americans this weekend by casually using the phrase “off the reservation” in a CNN interview — and finally had to apologize.

Clinton used the idiom in a reference to her husband Bill’s poor behavior in the past. “I have a lot of experience dealing with men who sometimes get off the reservation in the way they behave,” Clinton told CNN’s Jake Tapper, when asked how she would deal with GOP front-runner Donald Trump’s attacks on her.

Native Americans in the media and others immediately pounced, noting the saying’s dark origins in 19th-century laws that restricted Native Americans to reservation lands, the New York Post and others reported.

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Other people expressed unhappiness and confusion over her remarks.

“She has some battle-tested Native women with her campaign, but the way she has interacted with communities of color is mind boggling … ‘Super predators,’ ‘hot sauce,’ and now ‘off the reservation’ [are] among a huge list of problematic speech and behavior,” said Johnnie Jae of Native Max magazine, according to Native News Online.

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The social media upset that resulted from Clinton’s comments forced her campaign to apologize.

“Divisive language has no place in our politics,” tweeted Amanda Renteria, Clinton’s national political director. “Hillary Clinton meant no disrespect to Native Americans. She wants this election to be about lifting people up, not tearing them down.”

To read about Clinton’s other dilemma — handling Bernie Sanders’ supporters — click here.