From the summary:
We were asked to examine the cost of 4 trips to the Mar-a-Lago resort by the President and 3 international trips by Donald Trump Jr. and Eric Trump between January and March 2017.
– that federal agencies spent about $13.6 million for the Mar-a-Lago trips. The Departments of Defense and Homeland Security incurred most of the costs—about $8.5 million and $5.1 million, respectively. This excludes certain classified cost information.
– the Secret Service spent about $396,000 protecting the President’s sons and their spouses on 3 international trips.
We recommended that agencies comply with reporting requirements for protection costs.