No, gentlemen, if I am to be shot at, I want no man to be in the way of the bullet.
Source, in full
As military governor of Tennessee, asserting that he would walk alone, to friends who offered to escort him to the statehouse, after postings of a placard saying he should be "shot on sight." (c.1862); as quoted in Andrew Johnson, President of the United States: His Life and Speeches (1866) by Lillian Foster.