The first joint interview with Donald Trump and Mike Pence will air tonight on "60 Minutes."

A key super PAC backing Donald Trump has just $571,000 on hand

A well-connected pro-Donald Trump super PAC has failed to raise big money to support the Republican’s presidential bid, leaving him without outside resources to fight the well-stocked super PAC backing Democrat Hillary Clinton.

Rebuilding America Now, a group assembled by allies of top Trump advisor Paul Manafort, has just $571,000 in cash on hand, according to federal elections reports for the second quarter of 2016. It raised $2.1 million in start-up money and spent more than $1.5 million.

Wealthy donors have been slow to give — and Trump has signaled he doesn't want or need the outside groups.

The influential Koch brothers and billionaire casino mogul Sheldon Adelson remain on the sidelines. And though Trump has stepped up his own campaign fundraising, he is without support from a PAC that can raise unlimited funds – and attack Clinton.

On the other side, Priorities USA, the pro-Clinton PAC, has raised almost $100 million, with more committed. It is running TV ads bashing Trump in key states.

Rebuilding America Now operatives had boasted of big-money backers, including Trump’s longtime friend Tom Barrack. But the funds have not arrived, and the wealthy Los Angeles developer continues to raise money separately for Trump’s campaign and a joint operation with the Republican Party.

Another pro-Trump PAC, Committee for American Sovereignty, run by former allies of another Trump supporter and former presidential candidate, Ben Carson, has also struggled. It reported just $33,231 cash on hand for the quarter.

Quarterly reports for the newer groups were due Friday, and monthly summaries will be out in days as various entities compete for cash.

One brighter spot for Trump could be the Great America PAC, headed by veteran GOP strategist Ed Rollins and operatives in California. It has been steadily raising and spending funds to build a massive database of Trump supporters to turn out the vote in target states.

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