Apply Influence equal to the difference between the cost of the Disaffected character and the replacing character. In the end, we can only know the truth that lies within our own hearts. Target a character you control. That character is no longer participating in any conflict in any fashion. Rotate the character if he is not already rotated.
Long days lead into longer nights.
In the struggles of the Babylon 5 universe, sometimes ultimate physical limits are reached. Apply any even amount of influence. Meeting the demands of today is not nearly enough. That is, if we intend to survive tomorrow as well. If you have no agenda in play, rotate your ambassador and apply 10 Influence to select an agenda from your discard pile and immediately sponsor it.