"I ask my colleagues to help me support and pass this legislation honoring the bison and designating it as our national mammal," Enzi said. "The bison has and will continue to be a symbol of America, its people and a way of life."

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Three states have designated the bison as their state mammal and American bison freely roam national parks, such as Yellowstone and Grand Teton.

"The bison has been integrally linked to the economic and spiritual lives of many Native American tribes over the centuries," Enzi said. "Since our frontier days, the bison has become a symbol of American strength and determination."

The bipartisan bill is co-sponsored by Sens. Michael BennetMichael Farrand BennetDemocrats protest Trump's immigration policy from Senate floor On The Money — Sponsored by Prudential — Senators hammers Ross on Trump tariffs | EU levies tariffs on US goods | Senate rejects Trump plan to claw back spending Senators hammer Ross over Trump tariffs MORE (D-Colo.), Kent Conrad (D-N.D.), John HoevenJohn Henry HoevenGOP senators introduce bill to prevent family separations at border GOP senators want NAFTA deal from Trump by Labor Day Senate GOP urges Trump administration to work closely with Congress on NAFTA MORE (R-N.D.), Mike JohannsMichael (Mike) Owen JohannsMeet the Democratic sleeper candidate gunning for Senate in Nebraska Farmers, tax incentives can ease the pain of a smaller farm bill Lobbying World MORE (R-Neb.), Jerry MoranGerald (Jerry) MoranFormer USA Gymnastics CEO pleads Fifth at hearing GOP, Trump at odds on pardon power Lawmakers request meeting with Amtrak CEO over funding for route MORE (R-Kan.), John ThuneJohn Randolph ThuneRepublicans agree — it’s only a matter of time for Scott Pruitt Senate moving ahead with border bill, despite Trump On The Money — Sponsored by Prudential — Senators hammers Ross on Trump tariffs | EU levies tariffs on US goods | Senate rejects Trump plan to claw back spending MORE (R-S.D.), Mark UdallMark Emery UdallSenate GOP rejects Trump’s call to go big on gun legislation Democratic primary could upend bid for Colorado seat Picking 2018 candidates pits McConnell vs. GOP groups MORE (D-Colo.), Tom UdallThomas (Tom) Stewart UdallOvernight Energy: Spending bill targets Pruitt | Ryan not paying 'close attention' to Pruitt controversies | Yellowstone park chief learned of dismissal through press release Senate committee targets Pruitt scandals in spending bill Overnight Energy: DNC to reject fossil fuel donations | Regulators see no security risk in coal plant closures | Senate committee rejects Trump EPA, Interior budgets MORE (D-N.M.), and Sheldon WhitehouseSheldon WhitehouseLive coverage: FBI chief, Justice IG testify on critical report GAO to look into Trump's reduction of carbon social costs Overnight Energy: Pruitt used security detail to run errands | Dems want probe into Pruitt's Chick-fil-A dealings | Yellowstone superintendent says he was forced out MORE (D-R.I.). The National Bison Association, Intertribal Bison Council and Wildlife Conservation Society also support the measure.