Sen. Tom Udall Thomas (Tom) Stewart UdallLWCF modernization: Restoring the promise OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency MORE (D-N.M.) on Tuesday accused the Interior Department of refusing to answer an inquiry about President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's Independence Day plans, including how the additional cost of the plans will be covered.

“It is unacceptable that the Interior Department is failing to inform Congress about how it plans to spend taxpayer money to fund the president’s lavish July 4th plans, which reportedly include special access to the National Mall for the politically connected," Udall, the ranking member of the Senate Appropriations Subcommittee on the Interior, Environment, and Related Agencies, said in a statement.

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Udall also accused Trump of using taxpayer money on "a de facto campaign rally."

"The American people deserve to know how much of their money the president is spending to turn their July 4th celebration into a de facto campaign rally," he added. "All reports indicate that the president is planning to turn a national day of unity into a day of vanity – trying to use the military for political purposes and doling out perks to his political backers – at the taxpayers’ expense. We need answers."

"We will respond as appropriate," Interior Department spokeswoman Molly Block told The Hill in a statement on Tuesday. She did not elaborate.

Udall, along with Sens. Patrick Leahy Patrick Joseph LeahyBipartisan representatives demand answers on expired surveillance programs Democrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy MORE (D-Vt.) and Chris Van Hollen Christopher (Chris) Van HollenCongress must finish work on popular conservation bill before time runs out Democrats fear Russia interference could spoil bid to retake Senate Mid-Atlantic states sue EPA over Chesapeake Bay pollution MORE (D-Md.), wrote a letter last month to Interior Secretary David Bernhardt asking for details on the Independence Day plan and how the costs will be funded.

Trump has said he plans to speak at the Lincoln Memorial and said Monday that there will be military tanks at the event.