Arnold started the story, accusing Brunett of attacking him. Arnold has an anti-Trump show coming out which is why Downey is accusing him of doing this for publicity for the show.
Via Daily Wire:
In the early hours of Monday morning, actress and “The Bible” producer Roma Downey posted a photo of her bruised hand after an alleged encounter with actor Tom Arnold.
Downey claims Arnold “ambushed” her and her husband, producer Mark Burnett, at a charity event. An attorney for Arnold, however, claims the actor was the victim of an “‘unprovoked attack’ by Burnett,” reports The Hollywood reporter.
“Got this bruise tonight when Tom Arnold tried to ambush my husband Mark and me at a charity event,” Downey captioned the photo.