"Mercer" from "unleashed" tweet. Is Trump referring to this? He mentioned silk tie and diseases. See meanings of "mercer"
https://www.yourdictionary.com/mercer-disease
https://www.thefreedictionary.com/mercer
If TikTok facilitated political manipulation in the US, it should be regulated. It is an agent of a foreign government (China). Interfering in our political process should have serious consequences for a foreign government.
A theory of mine: I think Trump knows COVID-19 is not only a virus. A bacteria (parasite, intracellular organism) seems involved. Research how the original "Spanish flu" originated in Kansas and was started (apparently) when Dr. Frederick Gates started an experimental meningococcus vaccine program on military recruits. MERCER disease could refer to the dog "Mercer" in the image of dog 'unleashed'. MRSA, is a "staph" infection that is resistant to antibiotics. President Trump also mentioned a red silk tie. Another meaning of MERCER.