U.S. Sen. Bernie Sanders, I-Vermont, will campaign for Michigan Democratic gubernatorial candidate Gretchen Whitmer in Ann Arbor next week.

The event is planned for Oct. 19, according to a report from the Associated Press. Further details are not yet available, per a spokesperson from the Whitmer campaign.

Sanders' last public appearance in Michigan was for a primary opponent of Whitmer's, Abdul El-Sayed, who Sanders endorsed. Sanders made two speeches in favor of El-Sayed, in Detroit and Ypsilanti, on Aug. 7.

At the time, he said he was supporting El-Sayed because of his "bold and progressive ideas."

After losing to Whitmer in the primary election, El-Sayed threw his support behind her.

On this visit Sanders will be in Michigan on behalf of Whitmer. In the general election she is competing with Republican Bill Schuette, Libertarian Bill Gelineau and other third-party candidates. The election takes place Nov. 6.

Sanders' appearance is part of a multi-state swing through from Sanders, who is currently entertaining the idea of another presidential run. He plans stops in Iowa, South Carolina, Nevada, Michigan, Indiana, Wisconsin, Arizona, Colorado and California.

The Associated Press contributed to this report.