Vice President Joseph R. Biden, Jr. will campaign with Hillary Clinton for the first time next Friday in Pennsylvania, a key battleground state in the economically hard-hit Rust Belt, her campaign announced Thursday.

Biden and the presumptive Democratic nominee will appear together in Scranton to “discuss their shared commitment to building an America that is stronger together and an economy that works for everyone, not just those at the top,” her campaign said in a statement.

For months, after announcing last fall he would not seek the White House, Biden seemed lukewarm to Clinton’s candidacy. Biden formally endorsed Clinton on June 9, shortly after President Barack Obama did so.

The Washington Post reported Thursday that Clinton will campaign with Obama next Tuesday in Charlotte, the largest city in North Carolina, another possible swing state. The White House has yet to confirm that event.