Labour Party leader Jeremy Corbyn joined the mass protest against Donald Trump in London on Friday, where he said the message to the U.S. president was a call for a “world of justice not division.”

Speaking from Trafalgar Square to an enormous crowd after hundreds of thousands marched through the streets of London, Corbyn praised those gathered for “asserting our right to free speech and our right to want a world that is not divided by misogyny, racism, and hate.”

He took aim at specific actions the Trump administration has taken, including its cruel “zero-tolerance” immigration policies and decision to ditch the historic Paris climate accord.

Though he didn’t name Trump specifically, he said, “When somebody on a global stage condemns Muslims because they’re Muslims, it’s not acceptable and we will call it out.”

“When a major country says it wants to walk away from the UN council on human rights, I say, ‘Sorry, you are wrong. Human rights belong to all of us,'” Corbyn said. “And when a government condemns children because they’re Mexican or Guatemalan or from somewhere else in Central America, that is a breach of every international convention that I understand,” he said.

Beyond issues of humane immigration policies, Corbyn said the problem is “also about our planet, our world, and how we relate to each other.”

“Our environment is under threat,” he continued, saying that “there is no hiding place, ultimately, from foul air, from dirty seas, from polluted rivers. There’s no hiding place from the destruction of our natural world for any of us—unless we work together to protect it and our environment and our sustainability.”