Elizabeth Warren isn't holding back when it comes to criticizing Republican presidential front-runner Donald Trump.
Massachusetts' senior U.S. senator called the real estate mogul a loser in several social media posts Monday afternoon.
"Trump seems to know he's a loser. His embarrassing insecurities are on parade: petty bullying, attacks on women, cheap racism, and flagrant narcissism," she said in a post on Facebook.
She also repeated her criticisms in a series of tweets, saying Trump "stands ready to tear apart" a country built on values and calling him a "serious threat."
Warren, a Democrat who has yet to endorse a candidate in the Democratic presidential primary, also attacked Trump several times over the course of last week, including in an exclusive sit-down with necn's Alison King.
Responding to earlier criticisms, Trump brought up the 2012 controversy surrounding Warren's Native American heritage over the weekend.
"She's got about as much Indian blood as I have. Her whole life was based on a fraud," he told The New York Times.
He has not yet responded to Warren's Monday posts.