The chairwoman of the Democratic National Committee said she will resign this week in the aftermath of the release of thousands of embarrassing internal email exchanges among Democratic officials. Wasserman Schultz, a member of Congress from south Florida, said her resignation will take effect upon the close of the convention. It came amid a growing drumbeat for her to step aside, including strong pressure from the Clinton campaign, according to a senior Democrat familiar with the negotiations. Donna Brazile, a longtime Democratic strategist, will take over as interim chair, according to the DNC.