Standing outside Emanuel’s office, the Rev. Gregory Livingston said it would be ridiculous to seek Emanuel’s approval since they are marching in part to call for him and police Superintendent Eddie Johnson to step down because of their inability to get the city’s violence under control. Livingston said he expects arrests at the march and did not rule out marchers attempting to force their way into Wrigley Field, where the Cubs are set to play the San Diego Padres that night.