A threatening note taped to Nevada Sen. Dean Heller’s campaign office said the writer would lose his insurance if the Republican lawmaker voted for a Senate health bill and the writer would kill the senator, according to a report.

The person who left the note said he would die if Heller voted for the bill, according to a report in the Nevada Independent. Heller, one of the most vulnerable GOP incumbents up for re-election next year, has not decided how he will vote.