YORK — Hit with the inevitable questions about his track record in office, U.S. Sen. Bob Casey of Pennsylvania is putting more muscle into showing what he’s accomplished in his second term as the Democrat vies for a third six-year term in November’s election.

Accomplishment is the theme of his first campaign ad in the Philadelphia media market. On Monday, seven weeks until the election, Casey went to a micro-metal stamping and screw-machining firm to tout legislation he helped write to emphasize vocational skills training for high-demand industrial-sector jobs.

Being accused of doing nothing in office is a recurring theme for Casey. In 2012, his Republican challenger called him “Senator Zero” and this year, President Donald Trump and Casey’s Republican challenger, U.S. Rep. Lou Barletta of northeastern Pennsylvania, called him a “do-nothing.”

Casey shrugged it off Monday, saying his track record belies such claims.

“Not that it should, but if the election just came down to this metric of which candidate for the Senate had more bills signed into law by President Trump, I’d win that,” Casey said Monday.

Just this year, he’s had three pieces of legislation signed by Trump that he helped author, he said.