Roseanne Barr — sporting blond box braids, gold chains and sunglasses — says “Granny’s going bad” and “screw Eminem” in a new pro-Trump rap video with Canadian rapper Tom MacDonald.

Roseanne Barr’s career hasn’t been the same since she tweeted some highly offensive comments about Valerie Jarrett, a senior advisor to former President Obama. The posts led to her being ...