President Obama will hit the campaign trail for Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE next month in the battleground state of Pennsylvania, Clinton's campaign announced Friday.

Obama will campaign in Philadelphia on Sept. 13, about a month before the deadline to register to vote in the state, which he is expected to highlight. He will also discuss differences between Clinton and GOP presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE on economic issues.

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Obama held his first joint campaign appearance with Clinton in Charlotte, N.C., on July 5. Obama also spoke that month at the Democratic National Convention in Philadelphia, where Clinton embraced him.

Clinton campaigned with Vice President Biden in Scranton, Pa., earlier this month. She has led Trump by double digits in four consecutive polls this month in Pennsylvania.

Clinton's campaign announced Friday that Biden would campaign for her again Sept. 1 in Ohio, including the Cleveland area.

Trump and Clinton have been in a tense, race-related fight this week. Trump has repeatedly called her a "bigot" and pointed to criticism Clinton faced in 2008 for her attacks on Obama. Clinton delivered a speech Thursday tying Trump to white nationalist "alt-right" groups.