Clinton would edge out Trump by 13 points in a one-on-one vote, 51 percent to 38 percent, in the latest NBC News/Wall Street Journal survey

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Sanders bests Trump by 18 points, 55 to 37 percent. Sanders picked up a surprise win over Clinton in Michigan on Tuesday, though Clinton expanded her overall delegate lead.

Cruz trails Clinton by just 2 points, 47 to 45 percent, in a hypothetical matchup, while Rubio ties the former secretary of State at 46 percent each, according to the NBC/Journal poll.

Trump argued during a round of television interviews Wednesday morning that Republicans should unite behind him after his series of victories in the GOP race, including three on Tuesday night.

Trump, who has regularly boasted of his ability to defeat Clinton, said Wednesday on CNN that he thought she'd be the Democratic nominee.

He also argued on NBC's "Today" show that, if they united, "nobody could beat" the Republican Party.

The survey of 1,200 adults was conducted March 3–6 with an overall margin of error of 2.83 percent.