Nearly half of Republican voters disapprove of Paul RyanPaul Davis RyanSaagar Enjeti: Crenshaw's conservatism will doom future of GOP Retirees should say 'no thanks' to Romney's Social Security plan California Governor Newsom and family dress as 2020 Democrats for Halloween MORE’s performance as House Speaker, according to a new poll released Wednesday by Public Policy Polling.

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Only 40 percent of GOP voters are happy with Ryan’s stint as Speaker so far, while 44 percent disapprove. Those numbers worsen among all voters, with just 30 percent approval and 48 percent disapproval.

Many establishment Republicans have looked to Ryan to unify the party, and speculation has grown as to whether he would mount his own last-ditch candidacy to attempt to block presumptive nominee Donald TrumpDonald John TrumpMost Americans break with Trump on Ukraine, but just 45 percent think he should be removed: poll Judge orders Democrats to give notice if they request Trump's NY tax returns Trump's doctor issues letter addressing 'speculation' about visit to Walter Reed MORE.

The new poll indicates that concern about Trump’s effect on the party may be justified. Forty-five percent of voters said they would be less likely to vote for a Senate candidate who supports Trump, while just 26 percent say the opposite. Candidates who back the presumptive GOP nominee receive a 23 point net negative favorability rating from independent voters.

The poll surveyed 1,222 registered voters from May 6 to 9. It has a margin of error of 3.2 percent.