A break-in was reported at the office of Nevada Sen. Dean Heller and a threatening note addressed to the senator was left behind, according to The Hill.

LasVegasNow.com reported that the Las Vegas Metropolitan Police Department confirmed that someone broke into Heller’s office on Sunset but would not confirm the presence of a threatening note.

A spokesperson for the senator declined to comment, saying the office “can’t comment on or discuss ongoing investigations.”

Heller is one of the Republican senators who has thus far refused to endorse Senate Majority Leader Mitch McConnell’s bill to “repeal and replace” Obamacare. He has been the target of a far-right “astroturfing” campaign in which the Trump-aligned group America First Priorities spent $250,000 to place anti-Heller stories on social media.