WASHINGTON, DC - JULY 19: U.S. President Barack Obama (C) speaks to the media as (L-R) White House Domestic Policy Council Cecilia Munoz, Homeland Security Secretary Jeh Johnson, Attorney General Loretta Lynch, FBI Director James Comey and senior advisor Valerie Jarrett listen in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 19: U.S. President Barack Obama speaks to the media after meeting with Attorney General Loretta Lynch (L) and FBI Director James Comey in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 19: U.S. Attorney General Loretta Lynch listens to President Barack Obama speak to the media in a meeting also attended by FBI Director James Comey in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 19: U.S. President Barack Obama speaks to the media after meeting with Attorney General Loretta Lynch (L) and FBI Director James Comey in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 19: U.S. President Barack Obama (C) speaks to the media after meeting with Attorney General Loretta Lynch (L) and FBI Director James Comey in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 19: U.S. President Barack Obama speaks to the media after meeting with Attorney General Loretta Lynch (L) and FBI Director James Comey in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 19: FBI Director James Comey listens to U.S. President Barack Obama (C) speak to the media in a meeting also attended by Attorney General Loretta Lynch and in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 19: U.S. President Barack Obama (C) speaks to the media after meeting with Attorney General Loretta Lynch (L) and FBI Director James Comey in the Oval Office at the White House July 19, 2016 in Washington, DC. The president was briefed following the July 7 sniper killings of five Dallas police officers working a protest and Sunday's killing of three police officers in Baton Rouge, Louisiana. (Photo by Mark Wilson/Getty Images)