Joe Biden gave an unexpected response to a protester who said his friends died in combat in Syria

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VP Biden addresses heckler in Ohio

While campaigning for Hillary Clinton in Ohio on Thursday, Vice President Joe Biden was interrupted by a protester who repeatedly shouted at him about friends he said were killed during a combat mission in Syria.

"Some of my friends, my American friends died," the protester said. "Why did you tell the YPG to go back across the border," the man shouted, referring to a mission to liberate the Syrian city of Manbij.

The crowd attempted to shout the man down, but Biden addressed him directly.

"Because the deal was to get them into Manbij and to work they had to go back across the Euphrates so we could have special forces move in that's why," Biden explained.

As the man continued to lament that his comrades died, Biden said, "So did my son."

Biden's son, Beau, served in the United States Army for nearly 15 years. He died in 2015 after a long battle with brain cancer.

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RELATED: See images of Beau Biden's public funeral

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(L-R) Beau Biden's brother Hunter (top L), son Hunter (bottom L), widow Hallie, Vice President Joe Biden and daughter Natalie look on before a funeral mass for former Delaware Attorney General Beau Biden, son of Vice President Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Bryan Woolston
U.S. President Barack Obama delivers the eulogy during the funeral of former Delaware Attorney General Beau Biden, son of Vice President Joe Biden, at St. Anthony of Padua church in Wilimington, Delaware June 6, 2015. REUTERS/Kevin Lamarque
Vice President Joe Biden and his wife Jill Biden leave following the funeral for former Delaware Attorney General Beau Biden, son of Vice President Joe Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Pablo Martinez Monsivais/Pool
Singer Chris Martin of the band Coldplay hugs Vice President Joe Biden after performing the song "Til' Kingdom Come" during the funeral of Biden's son, former Delaware Attorney General Beau Biden, at St. Anthony of Padua church in Wilimington, Delaware June 6, 2015. REUTERS/Kevin Lamarque
Chris Martin of the band Coldplay sings the song "Til' Kingdom Come" during the funeral of former Delaware Attorney General Beau Biden, son of Vice President Joe Biden, at St. Anthony of Padua church in Wilimington, Delaware June 6, 2015. REUTERS/Kevin Lamarque
Vice President Joseph Biden (R) greets clergyman after a funeral mass for former Delaware Attorney General Beau Biden, son of Vice President Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Bryan Woolston
U.S. President Barack Obama returns to the White House with first lady Michelle Obama (R) and their daughter Sasha after attending the Delaware funeral of Vice President Joe Biden's late son Beau, in Washington June 6, 2015. REUTERS/James Lawler Duggan
President Barack Obama delivers a eulogy at the funeral for former Delaware Attorney General Beau Biden, son of Vice President Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Pablo Martinez Monsivais/Pool
(L-R) Beau Biden's brother Hunter (top L), son Hunter (bottom L), widow Hallie, Vice President Joe Biden, daughter Natalie and stepmother Jill Biden look on before a funeral mass for former Delaware Attorney General Beau Biden, son of Vice President Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Bryan Woolston
U.S. President Barack Obama (R) hugs Vice President Joe Biden during the funeral of former Delaware Attorney General Beau Biden, son of Vice President Joe Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Yuri Gripas/Pool
A procession carrying a casket enters the funeral of former Delaware Attorney General Beau Biden, son of Vice President Joe Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Yuri Gripas/Pool
Vice President Joe Biden attends the funeral of his son, former Delaware Attorney General Beau Biden at St. Anthony of Padua Church in Wilmington, Delaware June 6, 2015. REUTERS/Doug Mills/Pool
President Barack Obama arrives at the funeral of former Delaware Attorney General Beau Biden, son of Vice President Joe Biden, at St. Anthony of Padua Church in Wilmington, Delaware June 5, 2015. REUTERS/Doug Mills/Pool
NEW CASTLE, DE - JUNE 6: The Delaware Health and Social Services posts a note of thanks to former Delaware Attorney General Beau Biden June 6, 2015 in New Castle, Delaware. Biden died at 46 following a two-year battle with brain cancer. A mass of Christian burial was held at nearby St. Anthony of Padua Church in Wilmington, Delaware. U.S. President Barack Obama delivered a eulogy for the son of Vice President Joe Biden. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: U.S. Vice President Joe Biden (C) arrives with family for a mass of Christian burial at St. Anthony of Padua Church for his son, former Delaware Attorney General Beau Biden, on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: A funeral procession marches towards a mass of Christian burial at St. Anthony of Padua Church for former Delaware Attorney General Beau Biden on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: U.S. Vice President Joe Biden (C) and his wife Dr. Jill Biden (R) arrive with family for a mass of Christian burial at St. Anthony of Padua Church for there son, former Delaware Attorney General Beau Biden, on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: Vice President Joe Biden (C) arrives with his family for a mass of Christian burial at St. Anthony of Padua Church for his son, former Delaware Attorney General Beau Biden, on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: (L-R) Eva Kislowski, 9, and Lauren Vernot, 7, hold a commemorative program for former Delaware Attorney General Beau Biden, as the hearse and Biden family arrive for a mass of Christian burial at St. Anthony of Padua Church on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: A funeral procession marches towards a mass of Christian burial at St. Anthony of Padua Church for former Delaware Attorney General Beau Biden on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: Onlookers gather across the street before the hearse and Biden family arrive for a mass of Christian burial at St. Anthony of Padua Church for former Delaware Attorney General Beau Biden, on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
WILMINGTON, DE - JUNE 6: The coffin of former Delaware Attorney General Beau Biden is carried into St. Anthony of Padua Church for a mass of Christian burial on June 6, 2015 in Wilmington, Delaware. U.S. President Barack Obama is expected to deliver a eulogy for the son of Vice President Joe Biden after he died at 46 following a two-year battle with brain cancer. (Photo by Mark Makela/Getty Images)
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