Massachusetts Senator Elizabeth Warren will endorse former Secretary of State Hillary Clinton for president in an interview with Rachel Maddow on Thursday night.
Warren will make the announcement during Maddow's show which airs at 9 PM EST.
Warren's announcement comes the same day President Barack Obama formally backed Clinton in a video lauding her qualifications for the job.
Both lawmakers had remained neutral throughout the sometimes bitter primary race between Sanders and Clinton, although the president was long thought to favor his former secretary of state. But Warren, who has made banking reform the centerpiece of her political career, was actively recruited as a potential Democratic primary challenger to Clinton.
Vice President Joe Biden also discussed with Warren the possibility of choosing her as his vice presidential pick when he was mulling whether to enter the race last year.
Reuters has more on the chances of Warren joining Clinton on the ticket:
While her thinking could evolve, Warren has concerns about joining a Clinton ticket, including the question of whether running two women would give the Democrats the best shot at defeating Republican Donald Trump, one source said.
Advisers to Warren, a fiery critic of Wall Street and a popular figure among progressive Democrats, have been in close contact with Clinton's campaign team and the conversations have increased in frequency in recent weeks, the sources said. Warren has signaled to people close to her that she is intrigued by the possibility of being Clinton's No. 2 but has not discussed the role with Clinton, 68, or anyone else from her campaign, the people said.
