Nearly 2 in 3 Americans disapprove of the way President Trump has handled healthcare reform, according Quinnipiac University poll released Wednesday.

Sixty-three percent of respondents say they don't like the way Trump is trying to overhaul the country's healthcare system, while 29 percent approve of his efforts, the poll found.

Republican efforts to repeal and replace the Affordable Care Act, however, don't get high approval marks either. The poll found that 58 percent of respondents disapproved of that plan. Conversely, only about 16 percent said otherwise.

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Senate Republican leaders unveiled a long-awaited healthcare reform bill last week. But as it stands, the measure has received mixed reviews from GOP lawmakers. At least nine Republicans have come out against the bill, and several others remain unclear or undecided on their position.

Senate Democrats have unanimously vowed to oppose the healthcare measure, called the Better Care Reconciliation Act.

Faced with dwindling support for the bill, Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.) said Tuesday that he would delay a vote on the bill until after lawmakers return from their July 4 recess, giving Republican leaders more time to make changes to the measure and rally support for it.

But despite promising for years to repeal and replace ObamaCare, doing so may be losing support among voters. According to the Quinnipiac poll, 51 percent of Americans said they don't want Trump to support efforts to repeal the law, while 45 percent said that he should support those efforts.

What's more, 46 percent said they would be less likely to vote to reelect their senator or representative if they support efforts to replace ObamaCare, while just 17 percent said they would be more likely to do so.

Still, a third of Americans — 33 percent — said that how their lawmakers vote on the issue wouldn't sway them one way or the other.

The poll was conducted from June 22 to 27. Quinnipiac surveyed 1,212 voters nationwide via landlines and cellphones. The poll has a margin of error of 3.4 percentage points.