Elizabeth Warren takes major step toward potential 2020 run

Massachusetts Sen. Elizabeth Warren took a major step toward a presidential run on Monday, announcing in a video message and email to supporters that she is forming an exploratory committee ahead of an expected campaign for the Democratic nomination in 2020.

With her announcement 13 months before the Iowa caucuses, Warren, who became a progressive star by taking on Wall Street after the 2007 financial crisis and, more recently, President Donald Trump, is the first Democrat with a national profile to take formal action ahead of an anticipated presidential campaign.