This is generally handled by way of a Motion.
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The case management conference is not the place or time. You need to make a motion or other pleading.
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If it is clear on the face of the complaint that the plaintiff has no standing, you can file a motion for judgment on the pleadings (assuming you have already answered). If you would need facts to prove your argument, you will need to file a motion for summary judgment which is a complicated, exacting thing to do. Code of Civil Procedure 438 deals with motion for judgment on the pleadings and Code of Civil Procedure 437c deals with motion for summary judgment.