INDIANAPOLIS -- Indiana Democratic Party Chairman John Zody wrote an open letter Friday to Governor Mike Pence, asking him to repay overtime security costs supported by Hoosier taxpayers while he is on the campaign trail to become the country's next Vice President.

The overtime costs were uncovered in a Call 6 investigation into the Executive Protection Section, which is staffed by Indiana State Police and charged with protecting the governor throughout his tenure no matter where he travels.

Zody asked Gov. Pence to use his campaign funds to repay the more than $20,000 in overtime costs that come directly from Hoosier taxpayers in the months since Pence became Donald Trumo's running mate.

Before Pence accepted the VP bid, the Executive Protection Section filed an average of 126.3 hours of overtime per month, costing taxpayers an average of $4,219.65.

That number shot up 335 percent in July when Pence was picked to be Trump's vice-presidential nominee, according to state police overtime records obtained through public records request made by Call 6 Investigates.

In July 2016, the Executive Protection Unit had 549.5 hours of documented overtime, adding up to more than $19,500 in costs.

Then in August, the amount of overtime declined slightly to 399 reported hours of overtime, but that cost still added up to more than $15,000.

You can read the full Call 6 investigation here.

“It is galling that John Zody would play politics with the security of the Pence family," said Gov. Pence's VP campaign Press Secretary, Marc Lotter.

You can read Zody's letter below: