In an open letter to the nation's law enforcement officers, President Obama mourns the recent killings of officers in Dallas and Baton Rouge, La., thanks officers for their service in the face of danger and calls for national unity. The letter, dated Monday, is addressed to "the brave members of our Nation's law enforcement community." In it, Obama says he met with the families of the officers killed in Dallas, and called and spoke with the families of those killed in Baton Rouge. "Each fallen officer is one too many," the president writes/NPR. More here.