Washington (CNN) Sen. Angus King accused President Donald Trump of using Christine Blasey Ford as a "political rally punchline" after Trump mocked Ford's testimony against Supreme Court nominee Brett Kavanaugh at a campaign rally.

"It made me feel sort of sick. I don't understand why he felt he had to do that," King, an independent from Maine who caucuses with Democrats, said in an interview Wednesday on CNN's "New Day."

At a rally in Mississippi Tuesday night, Trump imitated Ford and mocked her for not knowing the answer to questions involving the details of a high school party decades ago where she alleges Kavanaugh sexually assaulted her. Kavanaugh has denied the allegation.

King told CNN that the President's actions Tuesday night were not a way to win over Republican Sens. Jeff Flake of Arizona, Susan Collins of Maine and Lisa Murkowski of Alaska, the three key undecided votes on Kavanaugh's nomination.

"I don't think that was a way that would be calculated to win over those three votes," King said, adding that he doesn't know which way Collins is leaning "but I don't think the President helped her last night."

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