Former Democratic National Chair Says He's Disappointed By Party Leaders

The Democratic National Convention begins Monday with some controversy that threatens to divide the party. Party Chair Debbie Wasserman Schultz will step down as soon as the convention is over.

It's sparked by revelations in thousands of emails leaked by Wikileaks that party leaders actively sought ways to sabotage the presidential campaign of Vermont Sen. Bernie Sanders.

Sanders, who addresses the convention Monday night, says the emails confirm what he had long contended about an unfair process. But on ABC's "This Week," Sanders also called on his supporters to get behind Hillary Clinton to defeat Republican candidate Donald Trump.

Paul Kirk, a prominent Sanders supporter and adviser, says he's also disappointed by party leaders. The former National Party chair and former senator from Massachusetts joined WBUR's Morning Edition.