A new bill from Rep. Ted Lieu, D-Calif., would require President Trump to pay back the government for public money spent on travel to hotels or other properties that he owns.

The Stop Waste and Misuse by the President Act, or the SWAMP Act, finds that Trump's travel to his own properties, such as his Mar-a-Lago resort in Florida, "results in the American taxpayer effectively subsidizing the president's businesses."

"It is unacceptable for the president to maintain an interest in traveling to properties in which he has a direct financial interest, as the U.S. government is responsible for renting space for personnel in said private commercial entities," the bill said. "Every time the president travels to Mar-a-Lago, he necessarily promotes his private business interests via free press at the government's expense."

The bill said total security costs for each trip to Mar-a-Lago is $3.7 million, and other expenses are incurred, including overtime for local law enforcement and the cost of flights.

Lieu's bill would change the law in a way that would require Trump and other high-ranking officials that get Secret Service protection to pay back costs associated with traveling to properties they own.

Here's the key piece of the proposed law:

In the case of a person whom the United States Secret Service is authorized to protect under paragraph (1) or (2) of section 3056(a) of title 18, United States Code, if that person, while traveling for official business or for personal purposes, stays in a hotel or other establishment providing daily-rate accommodation in which that person has an ownership or financial interest, that person shall reimburse to the Treasury —

(1) any amount expended by the United States Secret Service for the provision of such protection; and

(2) any amount expended for other costs incurred by the Government pertaining to that stay.