Secret Service paid Trump's airline $1.6 million
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The U.S. Secret Service has paid the Donald TrumpDonald John TrumpSenate Republicans muscle through rules for Trump trial Collins breaks with GOP on attempt to change impeachment rules resolution Roberts admonishes House managers, Trump lawyers after heated exchange MORE campaign about $1.6 million to cover the cost of flying its agents with the GOP presidential nominee, Politico reports

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It is customary for Secret Service to reimburse campaigns for the cost of traveling with presidential candidates. It has reimbursed Hillary ClintonHillary Diane Rodham ClintonGabbard knocks Clinton's jab at Sanders: 'This isn't high school' Hill.TV's Krystal Ball rips op-ed comparing Sanders supporters to those of Trump Hillary Clinton responds to backlash: 'I will do whatever I can to support our nominee' MORE's campaign $2.6 million so far in this presidential cycle.

But because one of Trump's companies, TAG Air Inc., owns the plane he travels on, the government is effectively paying him. 

The Clinton campaign has largely relied on chartered planes from an outside private company.

A Politico analysis found that through the end of August, Trump's campaign has spent at least $8.2 million at Trump's businesses, including payments for renting event venues and office space.