Secret Service overpaid 2016 campaigns by $4 million for air travel

Members of the Secret Service escorting Democratic presidential nominee Hillary Clinton. Photo: BRENDAN SMIALOWSKI/AFP/Getty Images

The U.S. Secret Service reportedly overpaid a total of $4 million to 2016 presidential campaigns for air travel, reports CNN citing a report by the Government Accountability Office.

The big picture: It's another headache of a financial headline for the Secret Service. Less than a year into President Trump's tenure, the agency hit its overtime cap protecting POTUS and his family.