Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE has widened her lead over Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE in the latest national survey, with the presumptive Democratic presidential nominee now leading her Republican rival by 8 points.

Clinton leads Trump, 49 percent to 41 percent, among registered voters in the NBC News/SurveyMonkey weekly tracking poll released Tuesday. Last week, she led by 6 points.

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On the question of which candidate respondents think will win, regardless of whom they support, Clinton remains the favorite: Fifty-seven percent think she'll win, compared to 36 percent who think Trump will win.

Despite continued divisions in the GOP over Trump, a majority of Republican and GOP-leaning voters surveyed in the poll say Trump should be nominated at the party's national convention next month in Cleveland.

Sixty-seven percent of Republicans said Trump, the only candidate still on the Republican side, should be nominated, while 30 percent say someone else should be picked.

The poll of 6,556 adults, including 5,818 registered voters, was conducted online June 20–26, with an overall margin of error of 1.8 percentage points and a margin of error of 3.4 points for the 1,582 registered Republicans.