def get_trigger(self, trigger_id):
        """
        Retrieves the named trigger from the Weather Alert API.

        :param trigger_id: the ID of the trigger
        :type trigger_id: str
        :return: a `pyowm.alertapi30.trigger.Trigger` instance
        """
        assert isinstance(trigger_id, str), "Value must be a string"
        status, data = self.http_client.get_json(
            NAMED_TRIGGER_URI % trigger_id,
            params={'appid': self.API_key},
            headers={'Content-Type': 'application/json'})
        return self.trigger_parser.parse_dict(data)