Senate Democrats are trying to prevent 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 from being able to redirect Defense Department funding to construction of his border wall.

Democrats filed an amendment, spearheaded by Sen. Dick Durbin Richard (Dick) Joseph DurbinThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death MORE (D-Ill.), to the National Defense Authorization Act (NDAA) that would prohibit Trump from using national defense funds authorized by the mammoth policy bill toward the U.S.-Mexico border wall.

The amendment would also prohibit Trump from using national defense funds authorized between fiscal years 2015 and 2019 as part of the NDAA, an annual measure that outlines broad policy and spending guidelines for the Pentagon.

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The amendment is supported by Democratic Sens. 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 (N.M.), 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 (Vt.), Brian Schatz Brian Emanuel SchatzCDC causes new storm by pulling coronavirus guidance Overnight Health Care: CDC pulls revised guidance on coronavirus | Government watchdog finds supply shortages are harming US response | As virus pummels US, Europe sees its own spike Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (Hawaii), Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (Mont.) and Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (Conn.). Leahy is the top Democrat on the Senate Appropriations Committee, while Tester is the ranking member on the panel's Department of Homeland Security subcommittee.

The amendment is one of hundreds that senators have filed to the Senate's version of the NDAA, which lawmakers are expected to start debating this week.

Democrats face an uphill battle getting their amendment to the floor for a vote, given the GOP majority in the chamber.

But the amendment is in line with a similar provision in the House version of the NDAA, which the House Armed Services Committee advanced last week, signaling a fight over Trump using Pentagon funds for the border wall is likely to be a sticking point as both chambers move to reconcile their competing proposals.

Trump declared a national emergency in February to allow him to dip into military construction funding to build the wall without congressional approval. So far, the Pentagon has yet to use military construction money on the wall, but it has moved $2.5 billion from various accounts into its counterdrug account to use for the wall.

The Senate's NDAA currently includes the administration’s request for $3.6 billion to “back fill” money the White House diverted from the military construction account as part of Trump's national emergency declaration to build part of the U.S.-Mexico border wall. It does not include the administration’s request for an additional $3.6 billion in wall funding.