That’s the CNN logo on the blood spot.
Via Mediaite:
This isn’t the first time the president has used his Twitter account to share a meme of him committing violence against the cable news network that he constantly refers to as Fake News. This past summer, he retweeted a GIF showing him beating up a figure with a CNN logo as a head. He also retweeted (and deleted) a meme of a Trump train running over CNN.
Thank you President TRUMP!! pic.twitter.com/LKdkT0FL99
— oregon4TRUMP (@shawgerald4) December 23, 2017