Immigration agents in the United States have been directed to track down and deport thousands of migrant children who entered the country without their parents, according to an internal memo obtained by Reuters.

More than 600,000 immigrant children have crossed the U.S.-Mexico border without a parent or legal guardian since 2019, according to government data.

Days after telling legal groups who help migrant children who arrive in America alone — some so young they are in diapers or their feet dangle from their chairs in court — that they must stop their work,