New York Mayor Michael Bloomberg is seeking to ignite debate over immigration among the presidential contenders.
Bloomberg joined former White House Chief of Staff William Daley on Tuesday in addressing business leaders in Chicago, telling them that immigrants and the jobs and businesses they create are essential to America's economic recovery.
Bloomberg said he knows of no other way to help the economy "as quickly and cost-free" as opening the borders to those who would start up new businesses that will put people back to work.
Bloomberg and Daley both lamented that neither presidential campaign has spelled out proposals on immigration policy.
They also presented a report released Tuesday by a partnership of U.S. mayors and business leaders showing that immigrants started one out of four new businesses last year.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.