U.S. Sen. Elizabeth Warren is wading deeper into the presidential primary debate, sharpening her criticism of Donald Trump and cheering on Bernie Sanders.

The Massachusetts Democrat described the Republican presidential front-runner Thursday as a failed businessman who inherited a fortune from his father and then maintained it by cheating, defrauding people and skipping out on his creditors by filing for bankruptcy protection.

Warren also said she's troubled by the authoritarian image Trump is cultivating.

Warren has yet to endorse a candidate in the Democratic primary. She praised Sanders when she was asked if it was time for the Democratic senator from Vermont to drop out.

Warren told reporters that Sanders has put the right issues on the table, both for the Democratic Party and the country in general.  (Associated Press)

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