Multiple bills have been introduced to reverse the change:

FAIR BET Act (HR 4304) — introduced by Rep. Dina Titus (D-NV), this bill seeks to restore the full (100%) deduction.
NatP tax Blog
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NBC Sports
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WAGER Act (HR 4630) — introduced by Rep. Andy Barr (R-KY), this is a Republican-led effort to repeal the 90% cap.
CasinoBeats
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FULL HOUSE Act in the Senate (by Sen. Catherine Cortez Masto, D-NV) aims at a similar repeal in the upper chamber.
NBC Sports
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NatP tax Blog
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These efforts show bipartisan interest in reversing the deduction cut.
NBC Sports
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CDC Gaming
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However, so far, attempts have been blocked or stalled — for instance, Senator Todd Young (R-IN) objected to a unanimous consent move to overturn the change.
The Nevada Independent
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NBC Sports
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Additionally, the FAIR BET Act has gained new cosponsors, including both Democrats and Republicans, which suggests growing support.
CDC Gaming

⚠� Challenges and likelihood

Procedural hurdles: Because the change was part of a large tax/appropriations bill, rolling it back may require going through the same complex legislative processes, which are difficult to navigate.

Revenue impact: The limit is projected to raise about $1.1 billion over 10 years, giving it some fiscal appeal.
NatP tax Blog
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The Nevada Independent
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Political will: Some lawmakers reportedly weren’t aware the gambling change was included in the larger bill, so awareness and pressure may drive more support.
The Nevada Independent
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Timing: The 90% limit doesn’t take effect until 2026, so there is still time for Congress to act before implementation.
NatP tax Blog
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