The head of the African Union called out President Donald Trump on Monday for the ultimate American hypocrisy.

South African politician and chairperson of the AU commission Nkosazana Dlamini-Zuma addressed representatives of the continental unions 54 member states during a summit in Addis Ababa, Ethiopia on Monday. In her comments, Dlamini-Zuma referenced Trumps recent executive orderhalting the U.S. refugee resettlement program and blocking entry of individuals from seven Muslim-majority countries, three of which are AU members.

The very country to which many of our people were taken as slaves during the transatlantic slave trade has now decided to ban refugees from some of our countries, Dlamini-Zuma said, according to The Independent.

Trumps order did not name the countries that would be affected, but reporters quickly confirmed that individuals from Iran,Iraq,Syria,Sudan,Libya,Yemen and Somalia would be blocked from entering the country. The three African countries Libya, Somalia and Sudan are all members of the African Union.

What do we do about this? Indeed, this is one of the greatest challenges to our unity and solidarity, said Dlamini-Zuma, who is stepping down from the AU this summer and is expected to run for South Africas presidency.

The U.S.s role in the transatlantic slave trade constitutes one of the grossest abuses of human rights in the countrys history. The Trans-Atlantic Slave Trade Database estimates that more than 300,000 Africans were forcibly taken to the U.S. over the 360 years of the trades operation.

Today, the administrations treatment of Muslims has elicited comparisonsto the 1942 executive order President Franklin D. Roosevelt signed authorizing the internment of Japanese Americans.

Trump signed Fridays executive order on live television, claiming the move would keep radical Islamic terrorists out of the country.There have been no fatal terror attackson U.S. soil since 1975 by immigrants from the seven Muslim-majority countries. Nonetheless, the president asserted the order did not target Muslims.

Within hours of Trump signing the order, travelers from the implicated countries were being turned away at airports and even detained. The Department of Homeland Security told Reuterson Sunday that roughly 375 travelers had been affected by the order 109 who were denied entry to the U.S. while in transit, as well as another 173 who were stopped by airlines before boarding flights.

Thousands of religious leaders and organizations, as well as dozens of U.S. diplomatsand world leaderscriticized the order as protests erupted at airports around the country over the weekend.

United Nations Secretary-General Antnio Guterres also addressed the AU summit on Monday and praised the African countries for their peacekeeping efforts. Without mentioning Trump or his executive order,Guterres said: African nations are also among the worlds largest and most generous hosts of refugees. African borders remain open for those in need of protection, when so many borders are being closed, even in the most developed countries in the world.

Read more: