'Whining is what Donald Trump does best' -Biden

"Donald Trump has already started his attacks, calling Kamala 'nasty,' whining about she is 'mean' to his appointees," Biden said, chuckling.

Within minutes of Biden's announcement on Tuesday, Trump had called Harris "nasty," "horrible" and "disrespectful," while his campaign painted her as an extremist who would yank the moderate Biden to the left.

During his first joint appearance with Kamala Harris on Wednesday, Biden said it was "no surprise" Trump attacked his vice presidential pick so quickly.

"You all knew it was coming. You could have set your watches to it."