The Department of Homeland Security (DHS) has launched an investigation into Madhu Gottumukkala, the head of the U.S. cyber defense agency, following reports that he uploaded sensitive documents to ChatGPT. The incident has raised significant security concerns, prompting a thorough review by DHS to assess potential breaches and implications for national security. The probe aims to determine the extent of the data exposure and any potential risks associated with the unauthorized sharing of classified information.