Hillary Clinton leads Donald Trump by 11 points in the US presidential race, showing little change after she became the presumptive Democratic presidential nominee this week, according to a Reuters/Ipsos poll.
The online poll, conducted from Monday to Friday, shows 46 per cent of likely voters support Clinton while 34.8 per cent back Trump. Another 19.2 per cent support neither candidate.
Their parties hold conventions in July ahead of a November 8 election.
Clinton's lead was nearly the same a week ago, before she had amassed enough convention delegates to win the nomination and before Trump drew criticism from leaders of both parties for questioning the impartiality of a Mexican-American judge.
Trump, 69, enjoyed a bigger boost after becoming the presumptive Republican nominee in May. Having trailed Clinton, 68, for most of the year, Trump briefly erased a double-digit gap and pulled about even with the former secretary of state.
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Clinton this week defeated party rival Bernie Sanders, 74, in four of six nominating contests, most notably California and New Jersey, and won the endorsements of President Barack Obama, Vice President Joe Biden, Senator Elizabeth Warren of Massachusetts and other party leaders.
Trump this week sparred with party leaders and struggled with questions about his now-defunct Trump University.
A lawsuit accuses Trump and the for-profit school of defrauding thousands of people, including many who paid as much as $US35,000 ($A47,052.50) to learn Trump's real estate strategies.
Friday's results had 1276 respondents and a credibility interval, a measure of accuracy, of 3.2 percentage points.
