Donald Trump and Hillary Clinton are making big campaign promises as they prepare for a likely November election face-off – but a new poll shows voters have little faith either candidate can deliver if elected president.

The Quinnipiac University poll released Thursday showed that on Trump’s marquee campaign promise – to build a wall along the U.S.-Mexico border – just 24 percent of voters believe the presumptive Republican nominee would be able to construct it and have Mexico foot the bill.

As for Clinton’s call to limit secret money in politics or restrict the influence of Wall Street, voters are similarly skeptical.

Just 9 percent said she’d be able to remove ‘secret’ campaign cash from the political system; 63 percent predicted the Democratic presidential front-runner, if elected, wouldn’t even try. Likewise, only 15 percent said Clinton would be able to curb the power of Wall Street; 56 percent said she would not bother to try. Twenty-one percent said she’d try and fail.

“No matter which candidate you pick, you can cut the cynicism with a knife,” Tim Malloy, assistant director of the Quinnipiac University Poll, said in a statement.

Voters had a bit more faith that Trump would try to achieve his campaign promises, even if they doubt he’ll succeed. On the border wall, 39 percent said he’d try and fail, while 29 percent said he wouldn’t actually try.

And on his call to deport millions of illegal immigrants, 19 percent of voters said he would be able to do it. Forty-five percent said he’d try and fail, and 29 percent said he wouldn’t try.

The poll of 1,561 registered voters was taken May 24-30. It had a margin of error of 2.5 percentage points.