Final answer:
A motion to adjourn during a session of Congress cannot be made when another member has the floor, without following proper protocol or obtaining the necessary consent.
Step-by-step explanation:
During a session of Congress, the motion to adjourn cannot be made unilaterally when another member is speaking or has the 'floor.' The provision to adjourn, as stated in the Constitution, requires the consent of the other house if it is for over three days or to a location different from where the two Houses are sitting. In the Senate, discussions can continue with unlimited debate and without germane amendments until no one seeks recognition or a motion such as 'cloture' is passed. Cloture ends debate and typically requires a supermajority vote.
However, in practice, during debates, if someone is speaking (holds the floor), it would usually be seen as a breach of protocol to attempt to adjourn without consent or without following established procedural rules, such as those for cloture. Similarly, unanimous consent is often required for certain motions and could be used to adjourn a session if all members agree.
Therefore, without following the correct procedure or obtaining the necessary consent, a motion to adjourn cannot be made while another member is actively holding the floor and contributing to the session's proceedings. The overall legislative process is designed to ensure orderly conduct and respect for the contributions of all members.