Democrat Abigail Spanberger apologized to Rep. Dave Brat, R-Va., on Monday for an offensive missive left on the doorstep of his residence by a campaign volunteer.

Spanberger campaign manager Dana Bye confirmed that four high-school students who were volunteering for the campaign and canvassing near Brat’s 7th Congressional District neighborhood hand-wrote “Rot in hell Dave” on official Spanberger campaign literature and left it on the congressman’s doorstep. Bye said the individuals have been told they are no longer welcomed by the Spanberger campaign.