NEW YORK (AP) — Sen. Kirsten Gillibrand entered the growing field of 2020 Democratic presidential contenders Tuesday, telling television host Stephen Colbert that she's launching an exploratory committee.

"It's an important first step, and it's one I am taking because I am going to run," the New York senator said on "The Late Show with Stephen Colbert." She listed a series of issues she'd tackle as president, including better health care for families, stronger public schools and more accessible job training.

Gillibrand, 52, has already made plans to campaign in Iowa over the weekend, more than...