WASHINGTON (AP) — Facebook on Monday removed a campaign video by Republican Missouri U.S. Senate candidate Eric Greitens that shows him brandishing a shotgun and declaring that he's hunting RINOs, or Republicans In Name Only.

In the ad, Greitens, a former Missouri governor who resigned in disgrace in 2018, is flanked by a tactical unit outside a home on a tree-lined street as he whispers, "The RINO feeds on corruption and is marked by the stripes of cowardice," using a term popularized by former President Donald Trump and his allies to deride moderate or establishment Republicans.

The arm...