Joe Biden silenced a heckler as he publicly referenced the death of his son in an emotional outburst on the campaign trial.
The vice-president responded directly to a man shouting out "My friends died" in protest at the US intervention in Syria during a campaign rally for Hillary Clinton in Ohio.
"Will you listen - so did my son," he told the heckler.
His son Beau Biden, who served in Iraq with the US army, died of brain cancer at age 46 last year.
Mr Biden's unexpected outburst silenced both the protester and a group of counter-hecklers shouting support for Ms Clinton.
He was cheered as he extended a personal invitation to the protester to come and discuss his concerns after the rally.
"Look let me answer your question. Come back after and talk to me about this. OK? You have my permission,” he told the man.
Mr Biden had previously publicly shared his grief at the death of his son, who he described as "the finest man any of us have ever known".
He drew sympathy from across the political spectrum after describing his loss.
The vice-president later added that he would not challenge Ms Clinton for the Democratic presidential nomination as the grieving process had "closed the window" of mounting a campaign.