They can claim practically any amount and have it justified. Their lawyers are smart/crafty enough to enumerate lots of areas where they would be harmed fiscally, Ivanka since she has a clothing line and The Donald as a hotel magnate.
Proving a vulgar tweet having a dollar value & then claiming an economic loss is like swearing in a bar but falsely thinking it’s a bloody nose, but it’s not. The only thing that might stick is a “death threat”, if there was one. I would not waste high priced lawyers on dog barking.