Joe Biden boards a plane in Delaware en route to his campaign speech today in Pittsburgh, PA

Officials with former Vice President Joe Biden’s campaign announced Sunday that the Democratic presidential nominee will travel to southwestern Pennsylvania on Monday.

President Donald Trump, meanwhile, announced Monday morning that he would be visiting Latrobe on Thursday.

Details on the exact time and location of where Mr. Biden will appear were not immediately disclosed by the Biden campaign.

Pennsylvania has long been viewed as one of the key battlegrounds in the presidential election and both Mr. Biden and Mr. Trump are devoting much of their attention to the commonwealth. Mr. Trump narrowly won the Keystone State in 2016, beating Hillary Clinton by less than a percentage point, but the win in Pennsylvania helped propel him to the White House.

On Sunday night, the president was quick to respond to Mr. Biden’s scheduled visit. He tweeted that Mr. Biden “is coming out of the basement” to visit Pittsburgh in response to “plunging” poll numbers.