The opposition comes as the tax package cleared a key procedural vote in the Senate yesterday. The Senate voted 52- 48 to start debating the bill.
Yesterday's vote potentially could pave the way for the Senate to pass the package later this week. The Senate could start voting on amendments this evening.
Opposition to the tax "trigger" could doom a delicately negotiated proposal aimed at mollifying deficit hawks who worry that tax cuts for businesses and individuals could add trillions to the mounting national debt.
"Automatic tax increases are a special level of insanity," said Rep. Trent Franks, R-Ariz. "I don't think it survives."
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Rep. Mark Sanford, R-S.C., said the threat of an automatic tax increase would make businesses reluctant to invest.
"If businesses or individuals have no ability to plan on a rate, it makes an investment decision, for instance, very, very difficult," Sanford said.
Corker said he has received assurances from Republican Senate leaders and the White House that some sort of "trigger" would be added to the Senate package that would increase taxes if the economy doesn't grow and tax revenues don't increase -- as much as projected.
"While we are still working to finalise the details, I am encouraged by our discussions," Corker said.
Meanwhile, Republicans hit a procedural snag in their bid to use the tax bill to open Alaska's Arctic National Wildlife Refuge to oil drilling. Democrats said measures to fast-track environmental approvals violate a rule designed to limit budget legislation to provisions that are mainly fiscal in nature. Congressional aides said the Senate parliamentarian has signalled agreement with the Democrats.
The overall package is a blend of generous tax cuts for businesses and more modest tax cuts for families and individuals. It would mark the first time in 31 years that Congress has overhauled the tax code, making it the biggest legislative achievement of President Donald Trump's first year in office.
Senate Republicans hold a slim 52-48 majority in the Senate, meaning they can only lose two votes, with Vice President Mike Pence casting the tie-breaker.
Pence was dining last night with a group of Republican senators, some of whom have expressed reservations about the tax bill. Pence invited Flake, Daines, Lankford and David Perdue of Georgia to the vice president's residence to discuss the tax overhaul, budget and other priorities, the White House said.
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