Democratic Senator Elizabeth Warren—an outspoken critic of Wall Street and nemesis of Donald Trump—entered the 2020 race for the White House on Monday.

The 69-year-old progressive announced she was launching an exploratory committee for president, becoming the first major candidate in what is set to be an extraordinarily crowded Democratic primary, united by a singular focus on unseating the Republican Trump.

The move will help Warren raise funds and hire more staff early in the campaign cycle—an effort in which she already leads most other potential Democratic candidates.

Her announcement came 13 months before the Iowa caucuses that launch what is expected to be a boisterous primary season.