The ruling party or governing party in a democraticparliamentary system is the incumbentpolitical party or coalition of the majority in parliament, that administers the affairs of state. Within a parliamentary system, the majority in the legislature also controls the executive branch of government, thus leaving no possibility of dueling parties concurrently occupying the executive and legislative branches of government, such as in an American style presidential system where the party of the president does not necessarily also have a legislative majority.