Senate Democrats are introducing legislation to prevent the establishment of a federal religion-based registry for immigrants ahead of the incoming Donald Trump administration.

Nine Democratic senators said Thursday that they have filed a bill blocking the executive branch from registering people based on religion, race, gender, age, national origin or nationality.

"Contrary to the President-elect's beliefs, America's diversity is not a threat — it is, in fact, our greatest strength," Sen. Jeff Merkley (D-Ore.) said in a statement.

He added that "if our incoming President ever attempts to create a discriminatory database of Americans, let this be our warning shot: we will fight him every step of the way and in every way we can."

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