It remains unclear how often Blitz's auditors are reviewing the roughly 400-450 canvassers. If audits are done every few days " a person familiar with the matter said it was at least every five days " and canvassers are together frauding several hundred doors a day, that could quickly add up.

The problem of suspicious doors in the America Pac field operation underscores the risk of outsourcing a ground-game program, where paid canvassers are typically not as invested in their candidate's victory compared with traditional volunteers or campaign staff.

Musk has so far donated $75m to America Pac in the three months of its existence. Roughly $30m has been spent on the ground-game operation to drive the Trump vote, with the rest put towards digital and mail advertising for the former president, as well as for down-ballot Republican candidates.