Rep. Betty McCollum's office received a threatening fax Wednesday over her amendment to end the military's NASCAR sponsorships.

The fax, which declares "Death to all Marxists!" was turned over to Capitol Police, who said they are investigating.

The fax, forwarded to Hot Dish by McCollum's office, includes an obscenity-laden rant, and then concludes: "Without exceptions, Marxists are enemies of the United States Constitution! Death to all Marxists! Foreign and Domestic!"

The threat was first reported by Talking Points Memo.

McCollum's plan to de-fund the military's NASCAR sponsorships has received widespread attention over the past two days, with multiple stories on national cable outlets like CNN. The amendment, one of more than 500 in a continuing budget resolution, has yet be voted on.