Colorado Gov. John Hickenlooper (D) is staffing up ahead of his possible 2020 presidential bid, with his campaign manager conducting dozens of interviews with potential aides since September, a source close to Hickenlooper told The Associated Press.

Hickenlooper's team has hired a Democratic strategist, Anna Greenberg, to be his pollster and FK & Co as his national fundraiser, according to the AP source.

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The Colorado governor has himself conducted or participated in around 30 interviews, it added.

Hickenlooper has been hinting at a presidential run for months, saying this week that he is "beyond mulling" a White House bid.