The International Brotherhood of Teamsters on Wednesday declined to make an endorsement in the 2024 presidential election just hours after releasing internal polling data showing that the workers it represents strongly favor former President Donald Trump.

Among rank-and-file members of the major union, 59.6% surveyed said they believe the Teamsters should endorse Trump, compared to just 31% voicing support for Vice President Kamala Harris, a more than 25-point gap that remained more or less unchanged after the union ordered a subsequent survey after the Sept. 10 presidential debate. Despite the poll results, the union refused to make an endorsement as there was “no majority support” for Harris and a lack of “universal support” for Trump, it revealed on Wednesday.

A Teamsters spokesperson did not immediately clarify why the union had different standards for the two candidates. 

“The Teamsters thank all candidates for meeting with members face-to-face during our unprecedented roundtables,” Teamsters General President Sean O’Brien said. “Unfortunately, neither major candidate was able to make serious commitments to our union to ensure the interests of working people are always put before Big Business. We sought commitments from both Trump and Harris not to interfere in critical union campaigns or core Teamsters industries — and to honor our members’ right to strike — but were unable to secure those pledges.”

The union cited Trump’s refusal to commit to vetoing right-to-work legislation as part of its reasoning for not issuing an endorsement.

The Teamsters, which have historically supported Democrats and often donate to left-of-center causes, made an effort to court Republicans this election cycle. The union made a donation to the Republican National Committee, met with Trump, and O’Brien was even invited to speak at the Republican National Convention. Some on the right have resisted the union’s attempt to ingratiate itself among conservatives, like the Center for Union Facts which put up billboards outside the Republican National Convention calling the Teamsters “two-faced” over its history of liberal spending.

While Republicans were generally open to the Teamsters, the Democratic National Convention snubbed O’Brien by not allowing him to speak at the event, according to The Associated Press.

Harris is considerably less popular among rank-and-file Teamsters than President Joe Biden, who only trailed Trump by about 8 points in a survey ordered by the union prior to his withdrawal from the race. Union leadership met with Harris for a roundtable discussion on Monday, The Hill reported.

“We represent everybody from airline pilots and zookeepers, and we don’t just represent registered Democrats,” O’Brien said to reporters.

The Teamsters’ endorsement could have had a significant impact if it went to either candidate given the concentration of its members in the swing states of Michigan, Nevada and Pennsylvania, according to Reuters.