WASHINGTON — Connecticut for Lieberman Party Chairman John Orman called Tuesday for Sen. Joe Lieberman to resign, saying his advocacy of a military strike against Iran could explode into a global conflict.

"He has crossed the line," said Orman, a professor of politics at Fairfield University. "His unilateral warmongering could lead to a new World War III."

During an appearance on "Face the Nation" on CBS Sunday, Lieberman said the United States should consider a military strike against Iran because of Tehran's involvement in Iraq.