The Teamsters were slow to endorse Clinton, even as many other unions rallied around her. She has already received endorsements from groups including the National Education Association, Service Employees International Union, and more recently, the AFL-CIO.
But when the Teamsters declined to make an endorsement last fall, reports emerged that the group was trying to set up a meeting with Trump.
Trump has continued to lobby for the support of the Teamsters and other unions.
In addition, Hoffa appeared at a pension rally with Bernie Sanders last year, stoking speculation that the Teamsters were considering endorsing him over Clinton in the Democratic presidential primaries.
And reports last year said the Teamsters were interested in backing Vice President Biden if he entered the race. He eventually decided not to run.
The Teamsters’ support of the Keystone XL pipeline could be a wedge between the group and Clinton. The union has said the pipeline would create high-paying union jobs. Clinton came out against the controversial oil pipeline last fall.
The Teamsters are also opposed to the Trans-Pacific Partnership, a trade deal that has drawn criticism from Clinton, Sanders and Trump. Trump has stoked speculation that Clinton secretly supports the trade deal and would enact it as president, which she has denied.
