Rep. Barbara Lee Barbara Jean LeeOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats call for investigation into Pentagon redirecting COVID-19 funds Steph, Ayesha Curry to be recognized by the Congressional Hunger Center MORE (D-Calif.) is asking the United Nations to probe the impact of the Trump administration’s controversial “zero tolerance” immigration policy at the border.

The policy has led to the separation of roughly 2,000 children from their families, who are being prosecuted separately. President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE ended the separations on Wednesday with an executive order, but it's not clear how that will effect children already separated from their parents or guardians.

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“I am appalled by the reports and images from detention facilities in Texas and other states along the border, where more than 2,300 children have been separated from their parents by border patrol agents,” Lee wrote in a letter to the U.N.

The California Democrat asked the U.N. to investigate operations under the authority of the Department of Homeland Security and the Office of Refugee Resettlement at the border and “throughout the more than 17 states around the country that are now housing children who have been separated from their families."

“As a mother, a grandmother, and as a psychiatric social worker, I am most concerned for the physical and mental well-being of children separated from their parents at their most vulnerable time,” Lee continued.