Sen. Lamar Alexander (R-Tenn.) on Sunday fired back at the president's remark last week that Republican politicking was to blame for the defeat of the debt-commission proposal in the Senate.

Rather, Alexander stressed President Barack Obama should shoulder some of that responsibility, seeing as he is an "agenda-setter" with the ability to steer a majority of Democratic votes in the chamber.

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"The president gave a half-hearted endorsement of that over the weekend, not even mentioning it by name," Alexander told Fox News Sunday, adding he "ought to be able to pass it."

Obama took aim at the Senate GOP during his State of the Union address on Wednesday, during which he called out seven unnamed Republican lawmakers for reversing their support for the once-popular debt-reduction commission.

Consequently, the proposal fell short of the 60 votes it needed to pass, ultimately killing it.

The president has since promised to sign an executive order creating a weaker version of the panel, which would not have the power to compel Congress to vote on its recommendations. But that idea has hardly satisfied lawmakers on both sides of the aisle, including Alexander, who see it only as a political stunt, not an effective fiscal tool.

"I would say, Mr. President, don't waste your time on it, it's just a gesture...," Alexander said.