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Bill de Blasio, mayor of New York, right, talks to Senator Jeff Merkley, a Democrat from Oregon, before a news conference outside of the U.S. Capitol building in Washington, D.C., U.S., on Tuesday, May 12, 2015. De Blasio unveiled 'The Progressive Agenda to Combat Income Inequality at the news conference.' Photographer: Andrew Harrer/Bloomberg via Getty Images

Bill de Blasio, mayor of New York, right, talks to Senator Jeff Merkley, a Democrat from Oregon, before a news conference outside of the U.S. Capitol building in Washington, D.C., U.S., on Tuesday, May 12, 2015. De Blasio unveiled 'The Progressive Agenda to Combat Income Inequality at the news conference.' Photographer: Andrew Harrer/Bloomberg via Getty Images