Former Vice President Joe Biden clapped back after being confronted by a voter at an Iowa town hall on Thursday. In a town hall packed with Biden supporters, a retired farmer initially started questioning Biden’s capability of running for president due to his age and health. The questioning later became an opportunity for the voter to mention the Ukrainian investigations and its relation to Biden’s son, Hunter Biden. As the voter continued to speak, he accused Biden of sending is son to Ukraine to sell access to former President Barack Obama.

In his son’s defense, Biden sternly said, “You’re a damn liar, man. Nobody has said my son has done anything wrong.” Biden also defended his ability to compete for president. “Look the reason I’m running, is because I’ve been running a long time, and I know more than most people know and I can get things done,” he said. “That’s why I’m running.”

SLIDESHOW: TOP DEMOCRATS RUNNING FOR PRESIDENT IN 2020

After the back and forth, the voter stated that Biden does not have any more backbone than Trump and that Biden would not obtain his vote.