Story highlights Sen. Elizabeth Warren was interviewed Monday morning by NPR

She repeatedly said she was not running for president

Warren has emerged as powerful figure in the Senate as a voice for the left

(CNN) She's said it once, and she'll say it four times: Sen. Elizabeth Warren is not running for president.

Asked four times by NPR's Steve Inskeep on Monday morning whether she was running for president, Warren held her ground, repeating each time: "I am not running for president."

"That's not what we're doing. We had a really important fight in the United States Congress just this past week, and I'm putting all my energy into that fight, into what happens after this," the Massachusetts Democrat said.

Inskeep pointed out that she was speaking in the present tense, and that she hadn't said she would "never" run, but Warren didn't change her tune, eventually becoming so exasperated she demanded, "do you want me to put an exclamation point at the end?"

The questions came in the context of a growing movement to draft Warren into the presidential race, launched by a handful of progressive groups that see her as a transformative figure on the left.

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