My own opinion is, that the sponsors of S. 1805 ought to WITHDRAW the proposal, on the grounds that the amendments are contrary to the original and intent and purpose of the fundamental bill.
That the President demands a "clean bill"
Then, they ought to reintroduce the clean bill, Frist should hold an up/down vote.
Then it goes to the House "clean."
The NRA and Director Craig can save face that way too (maybe).