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Poll: Voters don't believe Trump's or Clinton's campaign promises

When it comes to campaign trail promises, voters aren't buying what Donald Trump and Hillary Clinton are selling, according to a new national poll out Thursday.

A Quinnipiac survey found that on several key platforms put forth by the presidential candidates, most voters are skeptical that they will keep their promises. On the issue of building a wall along the southern border and getting Mexico to foot the bill, less than a quarter of voters believe Trump would actually be capable of closing that deal. Thirty-nine percent believe he'll try and fail, while 29 percent think he won't even make the attempt.

Only 19 percent of voters also believe the presumptive GOP nominee will be able to deport the 11 million undocumented immigrants living in the U.S., while 45 percent say he'll fail at doing so. Twenty-nine percent believe he won't try.

Hillary Clinton calls Donald Trump a "fraud" 05:07

Trump's promise to bar Muslims from entering the U.S. nets the billionaire his highest score: Twenty-nine percent believe he can and will carry out that pledge, 42 percent think he'll make the attempt but won't succeed, and 21 percent believe he won't even make the effort.

Clinton fares worse on her campaign vows to rein in Wall Street -- an undertaking 56 percent of voters believe Clinton won't even attempt. Twenty-one percent think she'll try and fail, while just 15 percent expect her to carry out her promise.

Voters also don't believe that the former secretary of state is liable to curb secret money flowing into politics, with 63 percent saying they don't believe Clinton would even try to do so. Eighteen percent believe she would make an effort but eventually fail. Only nine percent think she would succeed.

On the pledge to reduce the debt of students at public and community colleges, however, voters are more likely to believe Clinton. Twenty-two percent of voters say she would succeed at this, while 39 percent say she would try and fail. Thirty-two percent of voters believe the Democratic front-runner won't even try.

The Quinnipiac survey also asked about the ratings of the Republican and Democratic parties: Democrats garnered a negative favorability rating, 44 to 48 percent, while the Republicans also drew a negative 34 to 56 percent favorability score. The Democrats' rating was the party's best rating since November 12, 2008.

For both parties, voters disapproved of the jobs they were doing in Congress. Voters disapproved of Democrats in Congress 63 to 31 percent, and disapproved of Republicans 80 to 12 percent.

Quinnipiac University polled 1,561 registered voters nationally from May 24 - 30. The survey's margin of error was 2.5 percentage points.

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