To acquire Portuguese nationality by choice, it is essential to meet certain criteria and avoid circumstances that may lead to opposition in the process. Among the reasons that could obstruct the acquisition are the following:
- Lack of Effective Connection: It is necessary to prove a strong and effective connection to the Portuguese national community.
- Criminal Conviction: If there is a definitive conviction with a prison sentence of 3 years or more for a crime punishable under Portuguese law, nationality may be denied.
- Holding Public Office or Non-Mandatory Military Service: If the individual holds public office without a predominantly technical character or has rendered non-mandatory military service to a foreign state, this may be grounds for opposition to the acquisition.
- Risk to National Security: Participation in activities related to terrorism, as defined by the law, represents a danger or threat to national security or defense, becoming a reason for opposition.
Some exceptions apply in cases of marriage or de facto union, when there are common children with Portuguese nationality, or when the marriage/de facto union has lasted for at least six years.
It is important to be aware of these conditions when seeking to acquire Portuguese nationality.