Trump’s pick to head the U.S. cybersecurity agency CISA has stepped down, leaving the position vacant amid Senate hurdles.

In a letter to the White House, Sean Plankey cited delays in his Senate confirmation and withdrew his nomination, marking more instability for an already beleaguered agency.

Plankey’s withdrawal comes as CISA faces its own challenges, including budget cuts, furloughs, and even accusations of censorship during the 2020 election. Nick Andersen has taken on interim duties since February 2025.

The move highlights ongoing political tensions within the administration and Congress over cybersecurity priorities, just as the agency prepares for an array of digital threats facing the U.S. and its allies.

With no clear permanent director named by Trump’s team, CISA’s ability to safeguard critical infrastructure remains uncertain until a new leader is appointed.