Jeh Johnson, the prominent Democrat and former Homeland Security Secretary, also announced last month he was leaving the firm, while Steven Banks, who had been head of the firm’s pro bono practice, departed in April, citing a desire to return to direct advocacy work.

The former prosecutor is leaving a firm that made ​a deal with the Trump administration for one that fought it.

Damian Williams, who will co-chair Jenner’s litigation department, had only been with Paul Weiss since January.