Sen. Elizabeth Warren just took a huge step toward her 2020 presidential bid

Pablo Martinez Monsivais/AP

Sen. Elizabeth Warren is calling on Trump officials to invoke the 25th Amendment.

• Sen. Elizabeth Warren announced she is launching an exploratory committee for a presidential run in the 2020 election.
• A campaign video and website went live Monday morning in which Warren describes her vision to defend the middle class, which she says "is under attack."
• The Massachusetts Democrat has been a long-expected candidate, most recently stoking attention when she said she would seriously consider the decision to run after the conclusion of the 2018 midterm elections.

Sen. Elizabeth Warren announced she has launched an exploratory committee for a presidential run in the 2020 election.

A campaign video and website went live Monday morning in which Warren describes her vision to defend the middle class, which she says "is under attack."

The Massachusetts Democrat has been a long-expected 2020 contender, and recently stoked attention when she said she would seriously consider the decision to run after the 2018 midterm elections.

Read more: Meet the 2020 presidential contenders who are poised to start campaigning right away in 2019

Though Warren has already secured a large amount of financial support, a Boston Globe editorial from earlier this month cited low support for a presidential run from her constituents.