New poll: Clinton widens lead over Trump

Hillary ClintonHillary Diane Rodham ClintonCongress won't end the wars, so states must Democrats say it's up to GOP to stop Trump 2024 Hillary Clinton to speak at Asian Americans and Pacific Islanders summit MORE widened her lead over Donald TrumpDonald TrumpFranklin Graham says Trump comeback would 'be a very tough thing to do' Man suspected in wife's disappearance accused of casting her ballot for Trump Stefanik: Cheney is 'looking backwards' MORE nationally heading into the Republican National Convention, a new poll released Sunday shows.

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The CNN/ORC poll shows Clinton leading Trump, 49 percent to 42 percent. In the same poll conducted last month, Clinton led Trump 47 percent to 42 percent. 

But in a four-way match-up with Libertarian Party presidential nominee Gary JohnsonGary Earl JohnsonNew Mexico lawmakers send recreational marijuana bills to governor Judge throws out murder convictions, releases men jailed for 24 years On The Trail: Making sense of Super Poll Sunday MORE and Green Party candidate Jill Stein, both Trump and Clinton lose ground.

Clinton carried 42 percent, while Trump had 37 percent, Johnson had 13 percent and Stein had 5 percent. 

That's a 4-point increase from the same poll last month for Johnson.

The poll also shows Trump gaining more support among Republican voters, with 56 percent saying they prefer him as the nominee over someone else, compared to 51 percent in June. 

The new poll was conducted from July 13 to 16 among 1,013 adults, including 872 registered voters, and has a margin of error of 3.5 percentage points. 

An NBC News/Wall Street Journal poll also released Sunday morning shows Clinton with a 5-point lead over her likely general election rival in results unchanged since June.

An ABC News/Washington Post poll released Sunday shows Clinton with 47 percent support nationally, while Trump has 43 percent.