President Donald Trump attacked Sen. Elizabeth Warren (D-MA) on Thursday, suggesting that her opposition to his policies is due to drug use.

Throughout his political career, Trump has frequently sparred with Warren, whom he refers to as “Pocahontas.”

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“It’s such a good question. It’s so vicious what they do. Elizabeth Warren said she was an Indian. We call her Pocahontas. She’s a liar,” Trump said Thursday while answering a softball question about claims from Warren, Sen. Bernie Sanders (I-VT), and other Democrats that he is trying to cut Social Security benefits for seniors.

“I watched her the other night. She’s all hopped up endorsing a communist in New York City, and she was all excited and jumping up and down,” Trump continued. “She’s got to take a drug test. She really does. She’s got to take a drug test. There’s no way somebody can act that way and be normal.”

The Washington Examiner reached out to Warren’s office for comment.

Trump then went significantly softer on Sanders.

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“Bernie Sanders, I don’t mind him so much. He’s just a liberal guy, very liberal guys, a wacky guy,” Trump mused. “He’s still sharp, you know? He’s 86 or 87 or something. He’s still sharp. You compare that to Joe Biden.”

You can watch Trump’s comments in full below.