It's customary to insert padding between mutually exclusive assertions, in order to maintain a pretense of respect for your readers' intelligence.
While this rule is widely disregarded, you set a new record -- a single left parenthesis -- for inadequacy in this regard.
From dictionary.com: 'immigrant - a person who leaves one country to settle permanently in another.'
Until said immigrants become naturalized, they are NOT citizens ('[a] person owing loyalty to and entitled by birth or naturalization to the protection of a state or nation'), and are therefore foreigners ('[o]ne who is from a foreign country or place').