VP hopefuls dueling for dollars as they show off their fundraising clout for Trump

As they audition for the role of Donald Trump's running mate, potential vice presidential nominees are showing off their ability to help the former president raise much-needed campaign cash. 

Closed-door fundraisers with top-dollar Republican donors appear to be the latest screen test venue for those vying to land on the GOP ticket alongside Trump, joining a list that includes teaming up with the former president at his rallies and showing up at his criminal trial in New York City in support of Trump.