An aide to Graham told The Hill Friday afternoon he would sign onto the Moran letter.
Advocates of the treaty say it’s an important tool to keep weapons away from terrorists, and that not including civilian arms would gut the treaty. They also argue that any Second Amendment concerns are invalid, because the Constitution would trump international law anyway.
NRA CEO Wayne LaPierre told the U.N. conference negotiating the treaty that 58 senators had signed onto letters against it, referring to 2011 letters from Moran and Sen. Jon Tester (D-Mont.). Moran is now circulating a new letter to be released next week.
McCain has not said whether he will also be on the letter, but he told The Hill he would be opposed to any treaty that restricted the Second Amendment.
The Obama administration did not include civilian arms on a list of red lines it had for the treaty, but it did vow to oppose “restrictions on civilian possession or trade of firearms otherwise permitted by law or protected by the U.S. Constitution.”