Dallas, Texas is bracing for a week of anguish, burying five police officers, killed by a man who the Dallas police chief said “was asking us how many did he get. And he was telling us how many more he wanted to get.”

President Barack Obama will be in Dallas Tuesday, once again assuming the role of consoler-in-chief at an interfaith service. With him, Vice President Biden and former president George W. Bush, who also was the governor of Texas.

Thursday’s killings of the police officers, Wednesday’s police shooting of a black man in Minnesota and Tuesday’s police shooting of a black man in Louisiana is again raising — and politicizing — the issues of policing and race relations — past, present and future.