Washington (CNN) President Donald Trump's first four visits to his Mar-a-Lago resort after Inauguration Day cost American taxpayers $13.6 million, according to a report released Tuesday by the US Government Accountability Office.

According to the report , some $10.6 million was spent between February and March 2017 on "operating costs of government aircraft and boats" and $3 million went toward "temporary duty costs of government personnel supporting the President's travel, including transportation, lodging, and meals and incidental expenses." Some $60,000 of that was paid directly to Trump's Florida club.

The Defense Department and the Department of Homeland Security incurred the majority of the costs, and the report says the estimate excludes certain classified cost information.

The report also analyzed the costs of three international trips by the President's sons Donald Trump Jr. and Eric Trump that took place in January and February 2017.

The report says protective details for the President's sons and their spouses on the trips to Uruguay, the Dominican Republic and the United Arab Emirates cost about $396,000. Commercial aircraft was used for these trips and no military aircraft supported their travel, the report says.

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