Journalists are a maligned bunch these days, especially those covering Donald Trump’s campaign rallies, during which the candidate routinely rails against the media and encourages his supporters to rough up protesters. Amid a steady uptick in violent incidents at his events, National Public Radio is offering all its political reporters a 90-minute crash course in “situational awareness,” similar to the hazardous-environment preparation news organizations often give to correspondents covering war zones.

NPR appears to be the only news outlet that is preemptively training its journalists covering Trump, as well as other political field reporters, on how to stay safe in hostile environments, according to The Washington Post. The effort to keep its employees safe comes amid a spate of physical altercations at Trump events, which the candidate in several cases has egged on with statements like “Knock the crap out of ’em, would you?” (A representative for NPR noted that the organization has offered such training to newsroom staff for more than 10 years.) Another time, he offered to pay the legal fees of a North Carolinian man who reportedly punched a protester in the face.

In recent weeks, violent incidents at Trump rallies have expanded to include members of the media, too. Earlier this month, Trump stood by his campaign manager, Corey Lewandowski, after he allegedly grabbed a female reporter hard enough to leave bruises. Before that, a Time photographer was placed in a chokehold by a member of Trump’s security team, and a CBS reporter was arrested and detained at another rally.

NPR did not reveal details to the Post about what its training entailed, but noted that something similar is offered to all its correspondents, “whether they work internationally or domestically.” That training could come in handy later this year in Cleveland, where Trump warned that there may be riots if the Republican Party denies him the presidential nomination at a brokered convention in July.

This story has been updated.