MILWAUKEE – In a year when political tensions already are running high, a group of protesters is fueling the acrimony by showing up to political rallies and events with a large American flag – and stomping on it.

The members of the self-described “F*** Your Flag Tour” most recently popped up at a Donald Trump rally Sunday in West Allis, Wis. They posted themselves next to the line of thousands of people waiting to get into the Republican presidential front-runner’s event at the local high school.

They proceeded to lay the muddied flag on the ground and stand on it, triggering heated exchanges with those nearby.