'Ours Is a Sacrifice You Will Never Know': Gold Star Family Members Demand Apology From Trump

Family members call Trump's comments "repugnant" and "personally offensive."

She later told ABC News she did not speak at the convention because it would have been too painful.

"Your recent comments regarding the Khan family were repugnant and personally offensive to us," reads the joint letter published on VoteVets.org. "When you question a mother's pain by implying that her religion, not her grief, kept her from addressing an arena of people, you are attacking us."

"We feel we must speak out and demand you apologize to the Khans, to all Gold Star families and to all Americans for your offensive and, frankly, anti-American comments," the letter concluded.

The GOP candidate's latest remarks have caused widespread backlash as Democrats and Republicans alike have defended the Khan family.