Iraq's Popular Mobilization has called on the country’s government to ban U.S. nationals from entering Iraq and also to expel those already in the country.

The move comes as a retaliatory measure against the new U.S. travel ban that the new U.S. President Donald Trump has imposed on some Muslim-majority countries.

Popular Mobilization is a coalition of paramilitary groups that fight ISIS in Iraq. It became an approved body last year by the Iraqi government.

The call to bar U.S. nationals was issued in a statement by the body’s spokesman, Ahmed al-Assadi.

Following the U.S. president’s decision to ban Iraqi nationals from entering the United States, we call on the Iraqi government to ban Americans from entering the country and also to expel those already in Iraq, al-Assadi said.

Trump’s decision has sparked outrage across the world, as many denounced the move as “discriminatory” and urged the impulsive president to reconsider his decision.

“I am heartbroken,” said Malala Yousafzai, the Pakistani student activist and Nobel Peace laureate, “that today President Trump is closing the door on children, mothers and fathers fleeing violence and war.”

“We need to keep this country safe, but we should do that by focusing on people who actually pose a threat,” said Facebook Inc. Chief Executive Officer Mark Zuckerberg. “Expanding the focus of law enforcement beyond people who are real threats would make all Americans less safe by diverting resources, while millions of undocumented folks who don’t pose a threat will live in fear of deportation.”