2Congress also may preclude a claim under Bivens v. Six Unknown Fed. Narcotics Agents, 403 U. S. 388 (1971), against federal officers if it affirmatively forecloses one. “Even in circumstances in which a Bivens remedy is generally available, an action under Bivens will be defeated if the defendant is immune from suit,” Hui v. Castaneda, 559 U. S.
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