WASHINGTON - A top Republican is rejecting a potential compromise on gun control negotiated by moderate Republican Sen. Susan Collins of Maine.

Texas Sen. John Cornyn, the No. 2 Republican in the Senate, said Monday that Collins' proposal is problematic because it would immediately prohibit the sale of guns to terrorism suspects who are on the government's no-fly list. Cornyn says the appeals process in the bill comes too late.

The Senate is voting Monday on an amendment from Cornyn to allow the government to delay a gun sale to a suspected terrorist for 72 hours, but require court action to block the sale permanently. It's unclear if Collins' legislation will get a vote.

Cornyn said that "any time you are denying an American citizen their constitutional rights it ought to be with evidence." He says the "burden ought to be on the government and it ought to come from a court."

A spokeswoman for Collins says the bill has "thorough and robust" protections for those who may mistakenly be on the list.