Hold the floor
Definition 1 of 1
Pro Tip 1/3Public Speaking
Used when someone is speaking at length in public, often in politics. 
During the debate, the candidate held the floor impressively.
Pro Tip 2/3Not Always Literal
'Hold the floor' can be metaphorical, not just physically standing and speaking. 
She held the floor on the conference call, detailing the new policy.
Pro Tip 3/3Control Tactics
It can be a strategy to control a conversation or outcome. 
He held the floor to prevent opposition from voicing concerns.