President Donald Trump will appear in Topeka, Kansas, Saturday night to rally support for candidates in two competitive House races and gubernatorial candidate Kris Kobach. But organizers of a large counter demonstration are concerned about public safety.

Police will corral demonstrators onto sidewalks sandwiched between traffic on a four-lane road and metal fencing more typically used to enclose livestock, the Topeka-Capital Journal reported.

Demonstrators will split between the north side of the venue in a space designated for Trump supporters and the south side in a space designated for Trump opponents.

“People have strong feelings about Trump and Kobach, either good or bad. Not many people are in the middle. You put those two groups in a space like this, in the course of last year or two we’ve seen this doesn’t always lead to good things,” said Rev. Sarah Oglesby-Dunegan, an organizer.

“We’ve seen a Trump supporter drive into a group of people,” she said, referring to the slaying of Heather Heyer in Charlottesville, Va., last year.