In an open letter to the nation's law enforcement officers, Obama said overcoming will also require resilience, the grace of loved ones and the good will of activists. The White House released the letter today.
It was dated yesterday, the day after two police officers and a sheriff's deputy were killed in Baton Rouge, Louisiana, after being ambushed by a lone gunman.
Baton Rouge is where police on July 5 fatally shot Alton Sterling, a 37-year-old black man outside a convenience store. Sterling's death sparked nationwide protests.
Obama has said nothing justifies attacks on law enforcement, a sentiment he reiterated in the two-page letter. The Fraternal Order of Police posted the president's letter on its social media sites.
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"Any attack on police is an unjustified attack on all of us," the president wrote.
The letter comes as Obama remains under intense criticism from some police officials and others who accuse him of fostering a climate that has led to the intentional killing of law enforcement officers.
Obama telephoned the families of the Baton Rouge officers on yesterday to offer his and the first lady's condolences. Last week, he paid tribute to the Dallas officers at a memorial service there. He also met a couple of times with law enforcement officials and others, and fielded questions during a televised town hall on race in America.
In the letter, Obama said "we will get through this difficult time together.