WILMINGTON, Del. — Joe Biden and Kamala Harris delivered an aggressive one-two attack on the character and performance of President Donald Trump on Wednesday as they made their election case for the first time as running mates.

Biden pitched his former primary rival as a smart, tenacious figure who will help him defeat Trump in November amid a pandemic, cratering economy and national reckoning on racism.

Harris is making history as the first Black woman on a national major party ticket.

Democrats see her as appealing to progressives, mainstream liberals, some independents and Republicans unhappy with Trump.

The president and his allies are attempting to cast her as too left-wing for the country.