The executive order titled "Providing an Order of Succession Within the Department of Homeland Security" establishes a clear line of succession for the role of Secretary of Homeland Security in cases where the current Secretary and other top officials are unable to perform their duties. The order specifies that the Administrator of the Transportation Security Administration, Under Secretary for Intelligence and Analysis, Director of the Federal Law Enforcement Training Centers, and Region 3 Administrator of the Federal Emergency Management Agency will take over in this order. It also revokes a previous order from 2016 related to succession within the Department of Homeland Security. Additionally, the President retains the discretion to deviate from this order if necessary.
Simple Explanation
The President made a new rule about who is in charge of Homeland Security if the boss can't do the job. It says who takes over next, but the President can change the order if needed.