Hickenlooper has long drawn speculation as a potential contender for the 2020 Democratic presidential nomination. He is term-limited as governor of Colorado and is stepping down from the position after 2018.

Democrats are expected to have a packed primary field in the next White House race, with several senators also viewed as likely presidential contenders.

Hickenlooper said in June that he would make a decision about a 2020 presidential run over the summer.