Joe Biden told NBC's "Today" that he is "not closing the door" on running for president in 2020.
The former Democrat VP hasn't ruled out running in 2020.
Can any of these potential candidates defeat President Donald Trump?
What if Joe Biden had run for president? What if Clinton had beat Obama back in 2008? 7 giant what-ifs of modern American politics.
The next US presidential election is three and a half years away, but who could face Trump next time round?
David Cameron faced an awkward diplomatic encounter with Turkey’s prime minister Ahmet Davutoğlu last night as he promised to share high-level intelligence on Islamic State fighters but his counterpart hit out at foreign “propaganda” about them passing through Turkish territory.
The FBI and Los Angeles police are investigating suspected Russian hackers who allegedly stole and posted online sensitive financial information about Michelle Obama, Joe Biden, senior law enforcers and about a dozen Hollywood celebrities.