Criticized for firing the FBI director, President Trump sought to reinforce his bond with law enforcement Monday, decrying the ambush-style killings of police last year during the Black Lives Matter movement, pledging to restore respect in the White House for police and even illuminating the White House in blue lights. At a memorial ceremony for fallen officers at the Capitol, Mr. Trump referred to the assassinations of police officers in Dallas, Texas and Baton Rouge, Louisiana during the peak of anti-police protests as “a stain on the very fabric of our society.” “We are living through an era in which our police have been subject to unfair defamation and vilification, and even worse … hostility and violence,” Mr. Trump said. “More officers were slain last year in ambushes than in any year in more than two decades.” Mr. Trump seemed to refer to former President Barack Obama when he told the audience of police officials and families of fallen officers, “I want you to know that patriotic Americans of all backgrounds truly support and love our police. A very sad thing is that many of today’s politicians don’t want to say that, don’t want to talk about that because it’s not politically correct or they think it might hurt them with the voters. I will say it and I will talk about it proudly.” During the ceremony, Mr. Trump tossed a white USA cap to 6-year-old Micah Glasser, son of Phoenix, Arizona, police officer David Glasser, who was killed in shootout a year ago. The president even put his support for police in lights. The White House was bathed in blue light Monday night, a move that Mr. Obama had resisted. Some law-enforcement officials criticized Mr. Obama during the height of police-minority tensions, accusing him of emboldening the BLM movement and putting more cops at risk by expressing sympathy for some unarmed minorities killed by police. Mr. Obama convened a task force on police practices in an effort to build better relations between police departments and minority communities. President Chuck Canterbury of the National Fraternal Order of Police praised Mr. Trump for the shift in tone. “In his short time in office, he has let America know that our law-enforcement officers are important and that their lives matter,” he said. The new administration’s attitude toward law enforcement is more than blue lights and warm words. Attorney General Jeff Sessions, who attended the ceremony, announced last week that the Justice Department is reversing an Obama administration policy and charging nonviolent, less-serious drug offenders with the most serious provable crimes, including some with mandatory-minimum sentences.