DETROIT -- Members of the Teamsters will host Vice President Kamala Harris for a roundtable discussion in the near future, but union President Sean O'Brien has yet to get an invitation to speak at next week's Democratic National Convention.

Kara Deniz, a spokesperson for the Teamsters, a union with 1.3 million members, stated in an email on Friday that they are coordinating with Harris' campaign to set dates for the roundtable discussion.

However, O'Brien, who caused some Democrats to be upset by addressing the GOP convention last month , has not received a response to his request to speak at the Democratic National Convention, which begins on Monday in Chicago, Deniz said on Friday night.

O'Brien made the request to the Democrats at the same time he asked the Republicans, she said.

An individual with knowledge of the convention's planning said on Saturday that O'Brien will not be speaking, but the Teamsters will have a presence on the convention stage. The person asked to remain anonymous because they are not permitted to discuss the schedule publicly.

Democrats have been the party of labor unions for many years, while Republicans have generally treated them with hostility. Most major unions, including the AFL-CIO and the United Auto Workers , have already endorsed Harris.

However, the Teamsters met with her GOP opponent, Donald Trump, in January, and O'Brien received a lukewarm response when he spoke on the opening night of the Republican convention in Milwaukee. In his speech, O'Brien criticized both major political parties for not doing enough to support working people.

The Teamsters union has stated that their decision regarding a presidential endorsement will be made after the conventions have concluded.

Earlier this year, Trump met with leaders from the International Brotherhood of Teamsters in an attempt to secure their support. Following the meeting, Trump boasted that a significant portion of union voters had shown support for him and suggested about a potential Teamsters endorsement, “Stranger things have happened.”

However, in a Monday conversation on the social media platform X with Tesla CEO Elon Musk, Trump praised Musk for dismissing employees who participated in a strike. Musk chuckled and agreed with him. While it remained unclear what Trump was referring to, these remarks drew criticism from labor unions who accused Trump and Musk of being anti-labor.

The United Auto Workers even filed unfair labor practice charges with the National Labor Relations Board, alleging that comments made by Trump and Musk interfered with workers who might be considering joining a union. The NLRB has announced that it will investigate these claims.

“Both Trump and Musk want working class people to be silent and compliant, and they openly mock the idea of opposing them,” UAW President Shawn Fain stated.

Trump's campaign dismissed the allegations as frivolous and a “shameless political maneuver.”