President Obama is hesitant to sign an international arms trade treaty opposed by the National Rifle Association, according to advocates for the pact.

Meetings with administration officials have them worried the White House doesn’t want to expend any more political capital on a treaty the NRA insists is a gun grab by the United Nations.

“I’m pretty confident they’re not going to sign” when the treaty first opens up for signatures on Monday, said Rachel Stohl, a senior associate with the Stimson Center think-tank, which supports the treaty.

She said she thinks Obama will still eventually sign the treaty, which his administration supports, but that she “wouldn’t be surprised” if he waited to sign “under the cover of darkness in August.”