Nope. Wouldn't have mattered who was in the White House, and wouldn't have mattered what they said. Once the dominoes started to fall around the world, our fate was sealed.
The world in 2020 is so mobile, nothing could have stopped this. It would have helped some if we would have tightened up our borders and restricted certain countries from coming here, but this would have only slightly delayed the inevitable.
Nope. Government action matters. Trump failed. Japan has only 1,086 cases. The United States has 32,000+. New York State alone has 17,530 and New York State is five times smaller than Japan in population. This is Trump's mess, the buck stops with him. The only question is how bad things will get. Hopefully New York state reaches a peak soon and then starts to level off.
As I finish writing this, the United States is now at 38,000+ cases and New York State is at 22,000+ cases. Japan still only has 1,086 cases. If New York State were a country, it would have the 6th largest total in the world now.