U.S. Sen. Elizabeth Warren, a liberal firebrand who has taken on Wall Street and traded barbs with Donald Trump, on Monday became the most prominent Democrat to announce a challenge to the Republican president in 2020.
Warren said she had formed an exploratory committee, which will allow her to begin raising money to compete in what is expected to be a crowded Democratic primary field before the November 2020 presidential election.
She said on Twitter she would announce her decision on whether to run early in 2019.