Trump (46 percent) has been leading the three-man Republican race with a huge 20 percentage point over Senator Ted Cruz (26 percent).

Ohio Governor John Kasich is placed third with 20 percent point, according to the poll conducted by CNN/ORG. As per the CNN/ORC poll, Trump would bring the most excitement if he were the nominee, with 40 per cent of Republican and GOP-leaning independents saying they would be enthusiastic with him as the nominee.

As many as 47 percent of Republicans say they'd most like to see Trump win their party's nomination, about the same as the 49 percent who said they would be most likely to support him in February.

Among the Democrats, Clinton continues to top Bernie Sanders in the race for nomination, with 51 per cent saying they'd most like to see her as the nominee while 44 percent backed Sanders to lead the party in the November election.

Meanwhile, Trump and Clinton slammed each other as both said the other is not qualified enough to be US president. On CNN, Clinton referred to recent statements by Trump, which she said makes him unfit for the presidency.

"We need steady hands, not a president who says he's neutral on Monday, pro-Israel on Tuesday and who knows what on Wednesday because everything's negotiable. Some things aren't negotiable and anyone who doesn't understand that has no business being our president," Clinton told an audience of American Israelis earlier in the day.

"I think it's important to listen to what he says. You have to take him at his word so to speak. He's been engaging in bigotry, bluster and bullying. And I think when it comes to understanding what he would do as president there are serious questions that have been raised in this campaign. Should he be the nominee we'll have to address them," she said.

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