Republican presidential nominee Donald Trump crossed a dangerous line when on August 9, 2016 he, I believe, suggested to a rally crowd that a way to keep a conservative Supreme Court would be to assassinate Hillary Clinton or, perhaps, judges.

I was a senior in high school when President John F. Kennedy was assassinated Nov. 22, 1963. I was finishing college at the University of Minnesota when Martin Luther King was murdered April 4, 1968, and then Robert Kennedy two months later.

These men transcended politics: they had greatness in their visions, fire in their words, and magic in their personas. So many hopes and dreams flickered when those men died – aspirations never extinguished but their energy dampened.

These tragedies inspired me to become an agent in the United States Secret Service. The image of a brave and desperate agent Clint Hill as he tried to save President Kennedy that dark day in Dallas moved this young man. Nobility resides in those willing to die to safeguard democracy.

I was trained to protect our leaders.

For half of my first year in the Secret Service, I protected former Vice President Hubert H. Humphrey. I also worked at the White House and traveled around the world in 1969 as part of President Richard Nixon’s security detail.

I know two things from these and other experiences in the Secret Service. First, courageous and determined women and men protect our leaders. Second, no one can be protected completely. If someone wants to get a shot at a leader, they probably can.

I fear for Hillary Clinton. As the first woman nominee for president with a long political history, she brings forth deep fear and hatred in extreme conservatives’–often prey to manipulation by talk radio and Fox News. We watched physically repulsive rage fueled by Republican pseudo-leaders toward Clinton at the Republican convention. We see and hear vulgar and rabid people—even young children—at Trump rallies. As Trump slides in the polls, what else might he say? Or, how might his “jokes” be interpreted by unhinged people? Aside from politics, many people in America are angry and afraid—legitimate anxieties exacerbated by Trump and other politicians. And we know that guns—even military automatic rifles—are readily available to deranged people.

Hillary Clinton faces danger. She and the Secret Service know it. I imagine her protective detail has grown since Trump’s reckless comments. I am sure hundreds of threats have been made against her life and many twisted and dangerous people are being watched and accounted for as she travels.

The agents of the Secret Service will do all they can to protect her and all our leaders. People who attend political events can keep their eyes open. And all can say a prayer for the safety and the well-being of those who want America to be her best self so our hearts will not be broken and our spirits disillusioned yet again.