$instanceID = # The ID of the System Defense policy you want to delete.
# Select the wired interface.
$ethernetPortRef = $wsmanConnectionObject.NewReference("SELECT * FROM CIM_EthernetPort WHERE DeviceID='Intel(r) AMT Ethernet Port 0'")
$agentPresenceInterfacePolicyRef = $wsmanConnectionObject.NewReference("AMT_AgentPresenceInterfacePolicy")
$agentPresenceInterfacePolicyRef.AddSelector("Antecedent", $ethernetPortRef)
# Traverse to the AMT_AgentPresenceInterfacePolicy instances that are connected to the CIM_EthernetPort instance.
foreach($agentPresenceInterfacePolicyItem in $agentPresenceInterfacePolicyRef.Enumerate("http://schemas.dmtf.org/wbem/wsman/1/wsman/SelectorFilter", $null))
{
	# For each instance, check if it is associated to the AMT_SystemDefensePolicy instance.
	if($agentPresenceInterfacePolicyItem.Object.GetProperty("Dependent").IsA("AMT_SystemDefensePolicy"))
	{
		# Get the AMT_SystemDefensePolicy object using its EPR.
		$systemDefensePolicyInstance = $agentPresenceInterfacePolicyItem.Object.GetProperty("Dependent").Ref.Get()
		if($systemDefensePolicyInstance.GetProperty("InstanceID") -like $instanceID)
		{
			$agentPresenceInterfacePolicyRef = $agentPresenceInterfacePolicyItem.Object.ToReference("Antecedent", "Dependent")
			$agentPresenceInterfacePolicyRef.Delete()
		}
	}
}