In January, taxes will automatically increase for nearly all taxpayers through the expiration of the Bush tax cuts.
This is what's been dubbed the "fiscal cliff" looming if Congress does not act to stop the automatic tax hike and spending cuts it previously enacted.
The vast majority of Republicans in Congress have signed a pledge not to support tax increases of any kind.
Speaking to ABC, Sen. Lindsey Graham (R-South Carolina) said he'd be willing to violate the pledge to reach a compromise.
That drew a response from Grover Norquist, who leads Americans for Tax Reform, to vow political retribution in an interview with CNN.
All four House Republicans from Colorado have signed the pledge.
Seeking comment from each on Monday, Reps. Cory Gardner, Mike Coffman, and Doug Lamborn all stated they would not break their tax pledges.
"Whether I like it or not tax revenues are on the table because the Bush tax rates are set to expire at the end of the year," Coffman said.
Rep. Scott Tipton's office did not directly answer questions about whether he would stick to the pledge.
"Speculation on anything but what ultimately is put on the table for a vote is premature and counter-productive to the negotiations taking place," wrote Tipton Spokesman Josh Green. "Congressman Tipton is hopeful that Republicans and Democrats will work together to pass a bipartisan solution to the fiscal cliff that includes legitimate spending cuts at its core, avoids sequestration, and initiates comprehensive tax reform while preventing one of the largest tax increases on Americans in history from going into effect."
In the meantime, Sen. Michael Bennet (D-Colo) is working with Sen. Lamar Alexander (R-Tenn) to come up with an emergency backup plan to delay the debate for another six months if necessary.
The terms of the backup plan and what happens with the Bush tax cuts in the meantime have not been agreed upon yet.
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