The law was upheld by popular referendum in November 2012.
They demanded a popular referendum be conducted in each of the four countries.
In 1946, Italy became a republic after the results of a popular referendum.
The new document was put to a popular referendum and approved on 20 May 1972.
They reiterated their call for a popular referendum on the country's future political system.
Any court decision that held a state or Federal law unconstitutional would be subject to a national popular referendum.
Only two countries chose to put the issue to popular referendums.
The popular referendum, which was held on September 11, also produced mixed results.
The design was approved by a popular referendum in 1900.
The changes would then have to be approved in another popular referendum.