I have my criticisms of Trump, but I fail to see where him doing something different would have amounted to anything.
The only thing that could have stopped the spread would have been keeping it in China. Once it spread to other countries, mass infection was inevitable.
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The Wuhan outbreak was recognizable to local doctors in the first week or so of December.
Some Wuhan doctors were warning colleagues to take precautions with certain kinds of patients at the beginning of the last week of December.
Word of the outbreak was
leaked out of China on December 31st.
China and WHO admitted on January 20th that human-human transmission was happening.
Domestic travel out of Hubei Province was shut down January 23rd.
China was still encouraging its carriers to continue international travel on February 4th.
Wuhan is a large industrial city of ~11 million people. Its industries do business all over China and all over the world. By the time
news of the outbreak was
leaked out of China the virus was already being spread around China and around the world.
Had China in mid-December told the world about the outbreak, informed the world around December 25th that human-human transmission was happening and shut down travel out of Hubei Province around that time, and shut down travel in and out of China and given the world the DNA sequence of the virus on January 1st or 2nd (when it was first sequenced), things could have gone much different.
IOW, by the time news of the outbreak was
leaked out of China many "horses" had escaped the barn, and China held the barn doors open into the month of February.