The Constitution may be amended by process of legislation. But acts of the National Assembly relating to the amendment of the Constitution are effective only if two-thirds of the legal membership are present, and at least two-thirds of those present give their assent. Acts of the National Council relating to the amendment of the Constitution also require a two-thirds majority of all the votes cast. If an amendment to the Constitution is to be adopted by the People by popular initiative, the assent of a majority of the qualified voters is required.
If the National Assembly adopts an amendment to the Constitution against the objection of the National Council, the President may not promulgate this law, if the National Council within two weeks demands a popular vote.
ARTICLE 77
The National Cabinet issues the general administrative regulations necessary for the execution of the national laws so far as the laws do not otherwise provide. It must secure the assent of the National Council if the execution of the national laws is assigned to the State authorities.
SECTION VI
THE NATIONAL ADMINISTRATION
ARTICLE 78
The conduct of relations with foreign countries is exclusively a function of the Commonwealth.
The States, in matters subject to their jurisdiction, may conclude treaties with foreign countries; such treaties require the assent of the Commonwealth.
Agreements with foreign countries regarding changes of national boundaries will be concluded by the Commonwealth with the consent of the State concerned. Changes of boundaries may be made only by authority of a national law, except in cases where a mere adjustment of the boundaries of uninhabited districts is in question.