Enzi said in a statement Tuesday that he opposes the legislation because he and other lawmakers haven't received adequate answers to how $475 million in existing 9/11 compensation and relief-program money is being spent.

“Sen. Enzi thinks it is reasonable to find out what happened to the money that has already been allocated before spending more,” spokeswoman Elly Pickett said.

In addition, Enzi said in a statement that he'd like to see how this legislation would be affected by a recent court settlement giving $625 million to 9/11 survivors.

Enzi isn't the only Senate Republican to oppose the legislation. Newly sworn-in U.S. Sen. Mark Kirk, R-Ill., has been the only GOP member to come out in favor of the bill. The U.S. Chamber of Commerce and at least one anti-tax group have also opposed the bill, saying the taxes imposed on companies would kill American jobs.

But many supporters of the bill — as well as at least one New York newspaper — have singled out Enzi for sending out letters against the bill. Supporters also allege that Enzi has sent out misleading information about the bill.

“He's the lead troublemaker,” said John Feal, who lost half of his left foot on Sept. 17, 2001, at ground zero as he was working to clean up the site.