George W. Bush: “Defending—the price for defending freedom will be high, but it's necessary to defend freedom.”

You've showed the great strength of America through your work—and that is your good heart.

Violence and vitriol must be purged from the public square. Members of other political parties are not our enemies; they are our fellow citizens.

History will remember him as among the finest public servants of his generation – a patriot who brought integrity, high intelligence, and seriousness of purpose to every position.

We are heartbroken by the loss of life and the agony so many are feeling.