Supporters of Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE expressed outrage and suspicion after reports of an email sent to Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE supporters with an image labeled "secret win" surfaced shortly after The Associated Press said she had secured the Democratic presidential nomination.

The AP based its declaration on its own delegate count, including superdelegates. But Sanders supporters say that is unfair because the unbound party leaders could potentially switch their support at any time in the weeks leading up to the Democratic National Convention in July.

#SecretWin #ElectionFraud This election continually reveals exactly the true nature of everyone involved. Dont be fooled by team colors. — Rebel_Love (@EbenGreyrose) June 7, 2016

#SecretWin Hillary and the medias way of bringing voters to heel. Your blatant cheating has turned half your party #BernieOrBust. Congrats! — Kid Stardust (@SvenSveetheart) June 7, 2016

Sorry, yesterday I said there was no proof of collusion. Is #SecretWin the smoking gun? https://t.co/DXv7ZbDRzZ — Keith Kahn (@keithkahn) June 7, 2016

Many Sanders supporters have voiced suspicions that Democratic Party leaders have rigged the primary against him to make sure Clinton wins the nomination.

Actor Tim Robbins, an outspoken Sanders supporter, blamed his loss in the New York primary on voter fraud, saying the “election is being stolen."