from WordReference.com https://forum.wordreference.com/threads/baffled-trump-tethered-crop.1481986/
Team by team, reporters baffled – Teams of television reporters are confused, don't realize what is happening.
trump – Well . . .
tethered crop – The only place this phrase is used is in photography and is basically synonymous with close up when applied to a person. It means an image on a camera tethered (attached via cable) to a computer is cropped i.e. only a section is visible. LIGHTROM: Tethered Cropping Preset | Photoshop Family Customer Community