Joe Biden never thought Hillary Clinton was a great candidate -- and, the former Vice President says he's not totally ruling out a run for president in 2020.

Biden made the statements at a conference in Las Vegas. And while he's been critical of the Clinton campaign, he said she would have been a good president.

►Related: Joe Biden on Hillary Clinton: 'I never thought she was a great candidate'

At the conference, Biden was asked if he could be a candidate in the next presidential election.

He said it was possible, but not probable.

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