The lead for the presidential candidates has narrowed to 42 percent for Clinton to Trump's 40 percent in the latest poll. A June 1 national poll by Quinnipiac showed Clinton edging out Trump by 45 percent to 41 percent.
When third party candidates were added the survey, Clinton received 39 percent, while Trump received 37 percent. Libertarian Party candidate Gary Johnson received 8 percent and Green Party candidate Jill Stein got 4 percent.
The poll of 1,610 registered voters was conducted from June 21 to Monday. I had a margin of error of plus or minus 2.4 percentage points.
The Quinnipiac poll differed from other recent polls, including the NBC News/Wall Street Journal poll, which have shown Clinton with a significant lead over Trump.
American voters surveyed said that neither candidate would be a good president, the poll showed. The political campaign has also increased hatred and prejudice in the nation, the national poll found.
"It would be difficult to imagine a less flattering from-the-gut reaction to Donald Trump and Hillary Clinton," Tim Malloy, assistant director of the Quinnipiac University Poll, said in a statement. "Voters find themselves in the middle of a mean-spirited, scorched earth campaign between two candidates they don't like."