Treasury Secretary Steve Mnuchin speaks about sanctions against Turkey at a news briefing at the White House in Washington, October 11, 2019.

Treasury Secretary Steven Mnuchin is pushing to delay a proposed disclosure of Secret Service spending on presidential travel until after the 2020 election, a spokesperson for Sen. Dianne Feinstein, D-Calif., said Thursday.

The Trump administration's maneuvering to put off providing cost figures related to the agency's protection of President Donald Trump comes as Mnuchin is in talks with Congress on a bill to move the Secret Service back to the Treasury Department, according to an article Wednesday in The Washington Post, which first reported on Mnuchin's efforts.

The cost of protecting Trump while he is away from the nation's capital has come under scrutiny.

According to the Post, Democrats have demanded that the legislation require the Secret Service, which was transferred from Treasury to the Department of Homeland Security in 2003, report costs related to Trump's travel within 120 days after it is passed. The disclosure would also include costs of protecting Trump's adult children, according to the newspaper.

A Treasury Department spokesperson said in a statement that Mnuchin and Secret Service Director James Murray have been working over "the past several months" to return the Secret Service to the Treasury Department.

"Conversations about the return of the Secret Service to the Treasury Department are ongoing, and we decline to comment on individual aspects of those conversations," the spokesperson said.

The Government Accountability Office published a report in January 2019 finding that federal agencies incurred costs of $13.6 million in a period of just over a month in 2017 when Trump took four trips to his Florida club Mar-a-Lago.