From the article: “What drug(s) cause the production of excess saliva? Her speech in the video above, and on many other occasions, sounds like she has excess fluid in her mouth. Slurring. She also monkeys around with her mouth a lot when we see her not speaking, like when she is seated behind the President.”
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From link: https://www.healthline.com/health/dental-and-oral-health/hypersalivation#diagnosis
Constant hypersalivation is usually caused by chronic health conditions that affect muscle control. When you have impaired muscle control, it can affect your ability to swallow, leading to saliva buildup. This can result from:
intellectual disability
cerebral palsy
facial nerve palsy
Parkinson’s disease
amyotrophic lateral sclerosis (ALS)
stroke