The Smithsonian is a national treasure, with people coming from all over the country and even the world to see it.
But the White House is now demanding the Smithsonian change its exhibits to align with Trump's wishes. Which is a big problem, because Trump is a blithering idiot who lies nonstop, and doesn't believe in science.
Add your name, demand that Trump back off, and that the Smithsonian reject his changes.