“There's no doubt RPW is now at a disadvantage with that money being gone,” Hitt said. The party and campaign needs money late in the race to make quick decisions, he said.

Hitt said the hackers were able to manipulate invoices from four vendors who were being paid to send out direct mail for Trump's reelection efforts and to provide pro-Trump material such as hats that could be handed out to supporters. Invoices were altered so when the party paid them, the money went to the hackers instead of the vendors, Hitt said.