The chances of Sheldon Adelson-backed Restoration of America’s Wire Act may be slim, but opponents of the bill refuse to budge from their stance against any federal ban of online gaming under RAWA.

On Thursday, The Center of Freedom and Prosperity led an alliance of close to a dozen groups in sending a letter to Congress opposing the proposed legislation.

In the letter addressed to House Judiciary Committee Chairman Rep. Robert Goodlatte, the coalition called RAWA an “outright assault on federalism.”

“The legislation tramples on the Tenth Amendment by banning state regulation of online gambling—further chipping away at the balance between state and federal governance. The bill would overturn state laws already on the books in three states and would prohibit states from selling lottery tickets online for their own constituents—rolling back at least another six state laws,” the group wrote.