Official rule text
66.2 To resolve the primary ability on the “Politics” strategy card, can produce and where that player can place those units. the active player resolves the following effects in order: a A player cannot produce a unit on a planet they do not control. i. The active player chooses any player that does not b If an ability allows a player to produce a unit in a system, have the speaker token. The active player may choose themselves as long as they do not have the speaker they may produce that unit in the space area or on a planet token. The chosen player places the speaker token in they control in that system. their play area; they are now the speaker.
View official source
Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 66.2