The Latest: Sanders wants Democratic Party leader to resign

Bernie Sanders wants the head of the Democratic National Committee to step down — after leaked emails suggested the party played favorites during the presidential primary.

Emails posted to the website Wikileaks show that at least some DNC officials were looking at ways to undercut Sanders' campaign, including questioning his religious beliefs.

Hillary Clinton's campaign manager accuses Russia of leaking emails on purpose from the Democratic National Committee to help Republican Donald Trump in the presidential election.

Robby Mook says on CNN's 'State of the Union that experts are telling the campaign Russian state actors broke into the DNC's emails, and that other experts say these Russians are now selectively releasing the emails.

President Barack Obama says Donald Trump's suggestion that the U.S. might not come to the defense of NATO allies is another sign of what he calls Trump's "lack of preparedness" on foreign policy.