SAN FRANCISCO – A grass-roots anti-war group that flooded Congress with more than a million phone calls and e-mails before the U.S.-led invasion of Iraq last year is planning a similar action next month, shortly before the expected hand-over of sovereignty to an interim Iraqi government June 30.

Win Without War, a coalition of liberal organizations including the online group MoveOn.org, wants the Bush administration to set a “date certain” for American troops to leave Iraq. Nationwide protests are in the works for June 26 and 27.

“Our substantial military presence has become a rallying cry for the Iraqi insurgency,” said Tom Andrews, a former Democratic congressman from Maine who now heads Win Without War. “A majority of Americans are very angry and very frustrated. The time has come to ignite a national movement against this outrageous policy.”

The organization is also calling for the resignations of Defense Secretary Donald H. Rumsfeld and those officials responsible for the abuse of Iraqi detainees.