Transcript for Women Lead Marches in the US and Across the World
More than a million Americans, sending a message to president trump on the day after his inauguration. Women leading marches across this country and really around the world. The size of the crowds surprising even organizers, but this question tonight. Can they sustain the momentum turning those marches into a movement? Here's ABC's can haveecilia Vega can have tonight. Reporter: The message to those protesters tonight from the press secretary, Donald Trump is fighting for them. Welcome to your first day. We will not go away. Reporter: But the president sending mixed messages on Twitter. First say, he was under the impression we just had an election. Why didn't they people vote? And then later -- out in force, exceeding the predictions. From Boston, to St. Louis to Denver to Phoenix. Lindel marching alongside her daugs and granddaughters. Democracy requires your effort. Reporter: All around the world. From Frankfurt to Paris, to London. It's significant in that it's galvanized hundreds of thousands of people like this. Reporter: And at the center of it all, half a million marchers, and this sign, I'm with her. We are a movement. It's, like, we're not -- we're not going to be stopped. And Cecilia Vega with us live tonight. So many families out there marching for different reasons. What are you hearing from organizers tonight about whether or not they can sustain this? Reporter: Well, David, they are hoping that this turns into a movement. They say they hope that with worldwide protests, this may inspire local action here at home, David. Cecilia Vega in Washington for us. Thank you.
This transcript has been automatically generated and may not be 100% accurate.