While speaking to students at Hamilton College in New York on Thursday, former President Barack Obama said people might have to give something up to stand against the policies of President Donald Trump.

According to the Washington Post, Obama used his speech to claim without proof the Trump administration is trying to tear down the international system that was built after World War II.

He also claimed Trump’s actions go against what Americans stand for.

“It has been easy during most of our lifetimes to say you are a progressive, or say you are for social justice, or say you are for free speech, and not have to pay a price for it…And now we’re in one of those moments when…it’s not enough just to say you’re for something. You may actually have to do something and possibly sacrifice a little bit,” Obama said, according to Fox..

Obama also said law firms and colleges need to push back more, claiming Trump wouldn’t get away with the same things if he were in office.

“It’s unimaginable that the same parties that are silent now would have tolerated behavior like that from me or a whole bunch of my predecessors,” Obama said.

He added that he’s worried about the federal government threatening schools that won’t crack down on students using their right to protest.

“All of you have grown up in an international order that was created by America after World War II. … This is an important moment because in the last two months, the U.S. government has been trying to destroy that order,” Obama said. “Democracy is pretty recent in its vintage. An international order where you cooperate instead of fight is new. It’s fragile.”

The speech wasn’t recorded, but students and media sources shared some of what was said afterward.