Harris aims to boost union support at Pittsburgh event with Biden, who last year joined workers on the picket line.

United States President Joe Biden has appeared at a campaign event with Vice President and Democratic nominee Kamala Harris for the first time since dropping out of the presidential race.

The pair spoke at a rally in Pittsburgh, Pennsylvania, on Monday to mark the Labor Day holiday. They hope to shore up support from unions and blue-collar workers.

Pennsylvania is considered a key battleground in the November 5 election, in which Harris will face off with former President and Republican candidate Donald Trump. The 81-year-old Biden was the presidential candidate until July when he abruptly dropped out of the race following a debate performance that raised concerns over his age.

Speaking on Monday, Biden promised he would “be on the sidelines” and “do everything I can to help” in the final stretch of the race. He condemned Trump as anti-union, saying, “He’d rather cross [a picket line] than walk one.”

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