The kaiser has vanished shortly before the first bombs from Madrid fell and his current location as well as that of family is unknown. The rest of the government is cooperating with the ORN
Also how on earth would Madrid have an extensive intelligence network in some random back water country on several thousand miles away. Also good luck finding enough spies that already spoke German to so extensively infiltrate Texas. Assassinating all of these politicians would also be extremely difficult given the very sudden nature of this attack. Even killing one high ranking official would require months of fore planning to study schedules, get agents into the country, and find a killing method. I doubt madrid had this much planning a Texas has only been supporting the commies for 3 weeks.