Democrat Senator Elizabeth Warren launches 2020 presidential bid Saturday Feb 09,2019

Senator Elizabeth Warren has said she will run for president, adding a fierce advocate of economic populism to an already crowded field of Democrats in USA vying for the presidency in 2020.

The Massachusetts Democrat, a leader of the party's progressive wing, made her announcement on Saturday from an historic site in Lawrence, northwest of Boston, that launched the US organised labour movement.

Warren, a Harvard Law School professor-turned-senator, may be the most well-known figure to enter the presidential race.