Democratic Sen. Michael Bennet announces 2020 presidential run

The 2020 Democratic field just won't stop expanding.

Sen. Michael Bennet (D-Co.) on Thursday officially announced a 2020 presidential run on CBS This Morning, which makes him the 21st Democrat to do so, The New York Times reports.

Bennet, who has served in the Senate since 2009, announced in April that he had been diagnosed with prostate cancer, saying this delayed plans for a campaign launch that month. He soon underwent a successful surgery, and his spokesperson said doctors determined he required no further treatment, Politico reports.

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The Colorado senator on CBS This Morning said his diagnosis was very "clarifying," making him realize he wanted to run for president and think about "what it would feel like to get a diagnosis like that and to not have insurance."

Bennet also tweeted that he's running because "we cannot be the first generation to leave less to our kids, not more."