Voters rejected progressive Massachusetts Senator Elizabeth Warren because "she's a mean person" and "people don't like her," Donald Trump said Friday, a day after she ended her presidential bid.

In off-the-cuff remarks to reporters at the White House before he signed a massive coronavirus emergency funding bill into law, the president also took a few hard jabs at former Vice President Joe Biden, who now is the clear Democratic frontrunner to face him in November.

"I think a lack of talent was her problem. She had a tremendous lack of talent. She was a good debater," he said, noting her attacks on former New York Mayor Mike Bloomberg, who also dropped out the race this week.

A spokeswoman in Ms Warren's Senate office had yet to respond to a request for comment.

Unlike Ms Warren, Mr Bloomberg quickly endorsed Mr Biden and said he would give his cash-strapped campaign a monetary boost.

Ms Warren, during a Thursday press conference in her driveway, said she would need "some space" and time before possibly endorsing Mr Biden or Mr Sanders, with whom she is much more ideologically in line.

Because her endorsement could be a final determining factor in who wins the 2020 Democratic nomination, Mr Trump appeared eager to ding her further.

"But people don't like her. She's a very mean person," he claimed. "People don't want that. They like a president like me, who's not mean."

Only millions of Americans and even more around the world think he is just that. Mr Trump frequently tries to turn allegations or accusations made against him on those who lobbed them his way or other political foes.

Though he laid off Mr Sanders - the president laid into the new frontrunner.

He contended that Mr Biden is proposing larger tax hikes than the further-left Mr Sanders, and would, if elected, be an anchor on the American economy.

"He's got people further left-wing than Bernie has," Mr Trump said of Biden advisers that could get administration jobs. "It wouldn't be good for Wall Street. ... And he's open about it: Joe Biden, his tax increases are staggering."

But the former vice president has described his domestic policy ideas -- including taxes -- as less expensive than those put forward by Mr Sanders.

"It doesn't cost $35 trillion over 10 years," he said at a fundraiser in February, according to a pool report from a journalist in the room. "Bernie's a good guy and he used to say, 'It's going to require a significant increase in middle class taxes.' When asked how much it was going to cost, he said: 'Who knows? We'll all find out.'"