They didn’t waste any time swatting away that friendly gesture did they?
Donald Trump likes to run his mouth in a stream of consciousness. This behavior endears him to his supporters who are tired of political spin and obfuscation from professional politicians, including most Republicans. Unfortunately, he sometimes engages his mouth before fully considering the ramifications and the potential for damage to himself.
The public announcement of the offer for support did nothing for Trump or Johnson. Once the offer became public, it had to be rejected. Had American help been accepted it would have been a public declaration American medical knowledge and care is superior to British NHS public healthcare. No government with a public healthcare system can admit publicly its care is deficient.
I watched the news conference and cringed when Trump announced he had offered American expertise to Johnson’s doctors. President Trump enjoys bragging about American exceptionalism and as a good leader he should from time to time. However, this is a situation where a human life is potentially in the balance and private diplomacy is needed for the political reasons indicated above. Sometimes national leaders need to be subtly diplomatic and unfortunately subtle diplomacy is not a core competence President Trump demonstrates. Hopefully Johnson will not die because advice and knowledge which could have been communicated privately and confidentially cannot now be received.