Rittenhouse previously argued that Trump was not a champion of Second Amendment rights and said he would write in someone else's name on the ballot instead, causing an uproar from his supporters.

The 21-year-old, known for shooting two men in Kenosha, Wisconsin, changed his tune on the former president in a post on X Friday afternoon.

"Over the past 12 hours, I've had a series of productive conversations with members of the Trump's team and I am confident he will be the strong ally gun owners need to defend our Second Amendment rights.

"My comments made last night were ill-informed and unproductive. I'm 100% behind Donald Trump and encourage every gun owner to join me in helping send him back to the White House."

The post comes only 12 hours after he doubled down on his statement that Trump did not support Second Amendment rights.