In San Francisco the demonstrators chanted for open borders and the end of nations (to be exact, their chant was "No borders. No nations.")
You might remember that it was revealed during the election campaign, via a leaked email, that Hillary Clinton likewise has dreams of open borders. She gave a speech for a Brazilian bank in which she said:
My dream is a hemispheric common market, with open trade and open borders
Trump's response was this:
Hillary Clinton's radical call for open borders, meaning anyone in the world can enter the United States without any limit at all, would end the United States as we know it today.
Trump is right to insist on border controls and to try to halt the shift away from nations (a shift that is underway in neighbouring Canada, where the PM, Justin Trudeau, has declared his country to be a "postnational state").
I truly hope that America does not go the same way and that Trump stands firm, despite the political pressure being raised against him.