Acting Customs and Border Protection Commissioner John Sanders will resign, a CBP official said Tuesday, as the Trump administration faces furor over treatment of migrant children.

He is stepping down amid backlash over conditions at a border patrol facility in Texas. Sanders’ departure is effective July 5, the official said.

Sanders’ decision to step down leaves the White House with yet another vacancy in a key role at a fraught time for U.S. immigration policy. The administration faces bipartisan pressure to improve living conditions for detained children reportedly left with poor nutrition and supervision. President Donald Trump has also threatened mass deportations if he cannot come to an agreement with congressional Democrats on tweaks to immigration laws.

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