President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Wednesday urged House Republicans to vote against a bill that would end a legal challenge to the Mashpee Wampanoag tribe’s reservation in Massachusetts.

Critics of the legislation, which is co-sponsored by Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.), have dismissed it as a thinly veiled attempt to allow the tribe to build a casino.

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“Republicans shouldn’t vote for H.R. 312, a special interest casino Bill, backed by Elizabeth (Pocahontas) Warren. It is unfair and doesn’t treat Native Americans equally!” Trump tweeted, deploying his oft-used derisive nickname against the senator, who is running for president in 2020.

Democratic leaders put the bill on a fast track for passage, allowing it to come to the floor on Wednesday under a suspension of the rules, which requires a two-thirds majority for it to clear the chamber.

The measure would terminate a years-long legal challenge to the tribe’s reservation by reaffirming the contested land belongs to it and barring future lawsuits challenging the claim.

A 2016 lawsuit brought by opponents of the tribe’s proposed casino resulted in the Department of Interior reversing plans to take 321 acres of land into custody on behalf of the tribe, according to The Cape Cod Times.

The proposed casino would be built by the Malaysian gaming conglomerate Genting.

Republican Rep. Paul Gosar Paul Anthony GosarPelosi must go — the House is in dire need of new leadership LWCF modernization: Restoring the promise Trump tweets his people have all left Drudge MORE (Ariz.) offered an amendment that would have banned a casino from being built on the land, but it was shot down in the House Natural Resources Committee.

Leaders in Rhode Island have also said a casino would cut into gaming business in their state.

Democrats have argued the bill protects land belonging to a Native American tribe that has long been interfered with by the U.S. government.