This is serious. A foreign object rolled across the POTUS on the skin of his face, right beneath his nose and his lower mouth --- that's skin, nose and mouth.
The moment this happened, Trump's security detail should have apprehended the woman, her team and all equipment, including the microphone. The media should have been held as each was vetted, by security standards, including social media, and the equipment, especially the microphone, was tested for pathogens and poisons. The presser should have immediately ended, POTUS escorted to his plane where his physician tested and began to monitor him for the same.
This sh!t isn't funny.