A pair of senators wants to use a mammoth defense policy bill to delay President Trump's controversial decision to ban transgender people from serving in the military.

Sens. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) and Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) have filed an amendment to the National Defense Authorization Act (NDAA) that would delay any action until 60 days after Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE finalizes his review on the decision and submits a report to Congress.

The amendment, if it ends up in the final version of the bill, could delay Trump's ban until the spring of 2018.

Mattis is already delaying the new enlistment rules for six months as he reviews the Pentagon's transgender policy.

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He has until Feb. 21 to turn over a plan to the White House on how to implement Trump's directive, including how to address transgender individuals that are currently serving in the military.

There's no guarantee that the Gillibrand-Collins proposal will get a vote. More than 300 amendments have been submitted to the Senate NDAA. The annual bill's status as must-pass legislation makes it a lightning rod for lawmakers hoping to change an administration's defense and foreign policy.

But Trump's decision sparked a backlash from both Democrats and Republicans.

Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) said earlier this year that forcing transgender individuals out of the military was "a step in the wrong direction."

"The Pentagon’s ongoing study on this issue should be completed before any decisions are made with regard to accession. The Senate Armed Services Committee will continue to conduct oversight on this important issue," he said in a statement.

The Senate is scheduled to take its first vote tied to the NDAA on Monday evening, when lawmakers will move toward starting debate.