The United States Government took a serious view of the letter recommending the plan for instigating strikes in American factories. Dr. Dumba, thrown on his defense, explained to the State Department that the incriminating proposals recommended in the document did not originate from him personally, but were the fruit of orders received from Vienna. This explanation was not easily acceptable. The phraseology of Dr. Dumba far from conveyed the impression that he was submitting a report on an irregular proposal inspired by instructions of the Austrian Government. Such a defense, however, if accepted, only made the matter more serious. Instead of the American Government having to take cognizance of an offensive act by an ambassador, the Government which employed him would rather have to be called to account. Another explanation by Dr. Dumba justified his letter to Vienna on the ground that the strike proposal urged merely represented a plan for warning all Austrians and Hungarians, employed in the munition factories, of the penalties they would have to pay if they ever returned to their home country, after aiding in producing weapons and missiles of destruction to be used against the Teutonic forces. This defense also lacked convincing force, as the letter indicated that the aim was so to cripple the munition factories that their output would be curtailed or stopped altogether--an object that could only be achieved by a general strike of all workers. The Administration did not take long to make up its mind that the time for disciplining foreign diplomats who exceeded the duties of their office had come. On September 8, 1915, Austria-Hungary was notified that Dr. Konstantin Theodor Dumba was no longer acceptable as that country's envoy in Washington. The American note dispatched to Ambassador Penfield at Vienna for transmission to the Austrian Foreign Minister was blunt and direct. After informing Baron Burian that Dr. Dumba had admitted improper conduct in proposing to his Government plans to instigate strikes in American manufacturing plants, the United States thus demanded his recall: "By reason of the admitted purpose and intent of Dr. Dumba to conspire to cripple legitimate industries of the people of the United States and to interrupt their legitimate trade, and by reason of the flagrant violation of diplomatic propriety in employing an American citizen, protected by an American passport, as a secret bearer of official dispatches through the lines of the enemy of Austria-Hungary, the President directs us to inform your excellency that Dr. Dumba is no longer acceptable to the Government of the United States as the Ambassador of His Imperial Majesty at Washington."