Article continues below advertisementKristi Noem's time leading the Department of Homeland Security is facing renewed scrutiny, with watchdog investigations and internal reports raising fresh questions about oversight, spending and potential national security risks.At the center of the controversy are two unfolding issues: a federal probe into high-dollar DHS contracts approved under Noem and her former adviser and rumored lover Corey Lewandowski, and a separate watchdog report warning of vulnerabilities in airport security procedures that remains unresolved months later.