“In fact, Secret Service agents would not be officially assigned to protect the president until after William McKinley was shot in Buffalo, New York, on September 6, 1901. The day McKinley was shot – he would die from his wounds eight days later – Robert Todd Lincoln was once again standing with the president, thus earning the dubious distinction of being the only man to be present at three of our nation’s four presidential assassinations.”

“In fact, Secret Service agents would not be officially assigned to protect the president until after William McKinley was shot in Buffalo, New York, on September 6, 1901. The day McKinley was shot – he would die from his wounds eight days later – Robert Todd Lincoln was once again standing with the president, thus earning the dubious distinction of being the only man to be present at three of our nation’s four presidential assassinations.”

— Candice Millard