Former Vice President Joe Biden said on Thursday that he never thought Hillary Clinton was the right choice to be the Democratic Party's nominee in the 2016 election.

"I never thought she was the correct candidate. I thought I was the correct candidate," Biden told attendees at the SkyBridge Alternatives Conference in Las Vegas, according to a report from the Street.

Biden's son, Beau, died from brain cancer at the age of 46 in May 2015. Following his death, the then-vice president said he and his wife, Jill, had decided not to focus their energy on running for the presidency, but rather coming to terms with what had just happened to their family.

Though he says it's unlikely, Biden wouldn't close the door on a potential 2020 run.

"Could I? Yes. Would I? Probably no," he said.