A majority of voters in the U.S. are opposed to several policies proposed by President Trump and congressional Republicans, including building a border wall and repealing ObamaCare, according to a new poll.

Six in 10 say they oppose building a wall along the U.S.-Mexico border, the president's foremost campaign promise, according to a Quinnipiac University poll released Thursday.

Only 37 percent support building a wall on the border. The percentage of voters opposed to the proposal increases to 65 percent if the U.S. has to pay for it, and 33 percent would support such a proposal.

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Slightly more than half of respondents, 54 percent, are also against repealing the Affordable Care Act, and 43 percent support the repeal of former President Barack Obama Barack Hussein ObamaThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon Trump appointees stymie recommendations to boost minority voting: report Obama's first presidential memoir, 'A Promised Land,' set for November release MORE's signature healthcare legislation.

About one-third of voters are "very concerned" or "somewhat concerned" they'll lose their current health insurance if ObamaCare is repealed, and 68 percent are "not so concerned" or "not concerned at all."

Half of voters are concerned the cost of their healthcare will rise with the repeal of ObamaCare, and 44 percent are concerned that quality of their healthcare will get worse if the law is repealed.

About half of voters are also opposed to restarting the Keystone XL and Dakota Access oil pipelines.

The poll finds majority opposition to reducing taxes across the board. Sixty-two percent oppose such reductions, even if it increases the deficit, and 31 percent support that proposal.

About three-quarters of respondents say they are against lowering taxes on the wealthy, and 54 percent are against removing regulations on businesses and corporations.

The poll found greater support for other areas of Trump's agenda.

A majority of voters, 54 percent, support "renegotiating trade deals with other countries, even if it means paying more for the products you buy" and 87 percent of voters support increasing federal spending for roads, mass transit and other infrastructure.

The poll of 1,323 voters was conducted Feb. 16-21 via landlines and cellphones with a margin of error of 2.7 percentage points.