Sean Plankey Withdraws Nomination to Lead CISA Amid Senate Stalemate

Sean Plankey, President Donald Trump’s nominee to lead the Cybersecurity and Infrastructure Security Agency (CISA), has officially withdrawn his nomination after a protracted confirmation process that lasted over thirteen months. In a letter addressed to the White House and Homeland Security Secretary Markwayne Mullin, Plankey stated, “After thirteen months since my initial nomination, it has become clear the Senate will not confirm me.” He expressed his support for Trump’s future nomination for the position and emphasized the need for a confirmed director to lead CISA without further delay.

Federal News NetworkCyberscoopPoliticoCybersecurityDiveNextGov

Plankey was initially nominated in March 2025 and was viewed as a stabilizing choice for CISA. His nomination advanced out of the Senate Homeland Security Committee with a 9-6 vote in July 2025. However, it faced significant hurdles, primarily due to holds placed by various senators, notably Sen. Rick Scott (R-Fla.), who objected to a Coast Guard contract issue unrelated to Plankey’s qualifications. Despite being renominated in January 2026, the Senate remained unable to reach a consensus on his confirmation.

Politico

Plankey's withdrawal marks another setback for CISA, which has experienced considerable leadership instability and personnel reductions since Trump’s return to office. The agency has lost approximately one-third of its workforce, and its reputation has suffered as it scaled back services and abandoned critical functions. Currently, Nick Andersen serves as the acting director following the departure of Madhu Gottumukkala amid complaints about his leadership.

NextGov

Plankey’s letter highlighted the urgency for CISA to have a confirmed leader, stating, “The Nation and Department of Homeland Security Secretary Markwayne Mullin requires a confirmed director of CISA without further delay.” Rep. Bennie Thompson, the lead Democrat on the House Homeland Security Committee, criticized the ongoing leadership void, emphasizing the need for a qualified professional to steer CISA amid rising cyber threats. Rep. Andrew Garbarino (R-N.Y.) expressed disappointment over Plankey’s withdrawal, noting the critical need for stable leadership during a time of heightened cyber risks.

Cyberscoop

Critics have pointed to the broader implications of Plankey’s withdrawal, suggesting that the ongoing leadership crisis at CISA undermines the agency's ability to address pressing cybersecurity challenges. The agency's operational limitations have been exacerbated by budget cuts proposed by the Trump administration, further complicating its mission to secure critical infrastructure.

CybersecurityDive

While Plankey's withdrawal was anticipated due to the stalled confirmation process, there were conflicting reports regarding the reasons behind his renomination earlier this year, with some sources suggesting it was an administrative error. Additionally, the exact timeline for a new nominee to be put forward remains unclear, leaving CISA in a precarious position.

Federal News Network

• “After thirteen months since my initial nomination, it has become clear the Senate will not confirm me,” — Sean Plankey, Former Nominee for CISA

Politico

• “The Nation and Department of Homeland Security Secretary MarkWayne Mullin requires a confirmed director of CISA without further delay,” — Sean Plankey

Cyberscoop