Combative lawmakers won't sway Yellen: Senator

Senate Banking Committee member Heidi Heitkamp told CNBC on Wednesday that arguing interest rates with Federal Reserve Chair Janet Yellen is a futile effort.

"Do you think anything that anyone asked or anything that anyone said is going to have an effect on the chairwoman's decisions or the Fed's decisions? The answer is quite frankly, no," the North Dakota Democrat said in a "Squawk Box" interview.

Yellen's remarks before the committee on Tuesday were generally perceived as dovish on interest rates, which helped push the Dow Jones Industrial Average and S&P 500 to new records, and the Nasdaq Composite to its third-highest close ever.

"I think that she's extraordinarily cautious. I think she's careful. She talks about lagging indicators and that she's not going to make a decision based on a short-term period of data," said Heitkamp.

But there have also been other more hawkish interpretations of Yellen's stance—to which the senator said the Fed chair would probably feel she had a successful day on Capitol Hill if her comments were difficult to interpret.

Yellen appears before the House Financial Services Committee on Wednesday.

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