The Aurora City Council has tightened its rules for public input at its meetings, doing away with the option to call in with comments two weeks after a caller delivered a racist and antisemitic tirade that was broadcast in the chamber. Mayor Mike Coffman said before Monday’s vote that allowing live phone-in participation leaves the door open to vile content that the First Amendment does not permit the council, a government body, to curtail. “Somebody can call in from anywhere in the country and say whatever they want, and there’s nothing we can do,” he said.