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The National Conference of State Legislatures is protesting a plan in Congress to ban online gambling.

In a letter to lawmakers on Thursday, the bipartisan group said the push would amount to the federal government usurping the role of the states to decide the legality of gambling online.

“States have proven that they are effective regulators of the gambling industry and the proponents of this legislation fail to make a case that we have been negligent in our responsibilities to the industry and consumers,” wrote Oregon state Sen. Bruce Starr (R), the conference’s president, and Nevada state Sen. Debbie Smith (D), its president-elect.