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 says he’s “upset” with the Associated Press for “hounding” superdelegates and calling the Democratic presidential race for 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 the night before California and five other states had voted.

Speaking in an interview with NBC Nightly News, Sanders criticized the media organization, which on Monday night announced that Clinton had clinched the nomination after securing the support of several previously undeclared superdelegates.

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“I was upset with what the AP did,” Sanders told NBC anchor Lester Holt.

“They got on the phone, as I understand it, and they started hounding superdelegates to tell them in an anonymous way who they’d be voting for. And the night before the largest primary, the biggest primary in this entire process, they make the announcement. So I was really disappointed in what the AP did.”

Asked if he believes the announcement could suppress voter turnout — potentially keeping his supporters at home on Tuesday — the Vermont senator responded: “Yeah I do, and I was disappointed in what the AP did.”

Late Monday night, the AP — widely viewed as the gold standard for delegate tracking — declared that Clinton had passed the threshold for delegates needed to win the Democratic nomination.

Clinton will not win the nomination based solely on pledged delegates earned through the primary process, but Democrats rarely do.

Rather, she will rely on the support of superdelegates — party leaders who are not bound to any candidate — to push her over the top at the Democratic National Convention in Philadelphia in July.

This has infuriated Sanders and his supporters, who say that many of those superdelegates pledged their support to the former first lady nearly a year ago, before the extent of Sanders’s political strength became apparent.

Sanders is saying he’ll spend the weeks between now and the convention trying to flip those superdelegates into his column.

“We are on the phone right now,” he told NBC.

Clinton supporters argue that she will end the primary season with a healthy lead in pledged delegates by virtue of having won about 3 million more votes overall than Sanders.

Historically, a majority of Democratic superdelegates have cast their support to the first-place finisher to get that candidate over the line for the nomination.

“Defying history is what this campaign has been about,” Sanders said.