President Barack Obama will campaign for Hillary Clinton in Philadelphia next month.

His appearance in the city is scheduled for Sept. 13, the Clinton campaign said Friday.

The time and location of the event haven't been announced, though people interested in attending can sign up online.

"At a public event, President Obama will lay out the high stakes of November's election for Pennsylvania families and encourage Pennsylvanians to register to vote ahead of the October 11 deadline," the campaign said. "He will urge Pennsylvanians to support Clinton and her vision for an America that is stronger together, with an economy that works for everyone, not just those at the top."