What branch can ask congress to come together for a talk in certain situations

Under the feudal system, which of the following did lords grant to their vassals?

How did rituals maintain sumerian society

President of the united states has scheduled a cabinet meeting today to discuss energy policy with specific focus on pollution and global warming. given what you know of the executive branch, which group of attendees would the president most likely expect to provide up-to-date information and expert insight during this meeting?