The petition had over 12,000 signatures as of Monday afternoon.
Robert Naiman, policy director for Just Foreign Policy, wrote in a Huffington Post blog post on Monday that Clinton's silence could mean she was avoiding a position in order to pander to supporters that oppose the deal.
"Their fear is not that diplomacy with Iran will fail; their fear is that diplomacy with Iran will succeed," Naiman said of Clinton's "harder-line supporters." "That's why it's so important to smoke out Hillary on the Iran nuclear deal."
Petition via MoveOn.org:
Correction: This post incorrectly spelled Robert Naiman's last name. It is Naiman, not Naimun.