The Comptroller-General of NIS, Muhammad Babandede, disclosed this at the 2018 NIS award presentation in Abuja on Saturday.
According to Babandede, the service was fully involved in the election process, to ensure that no foreigner votes during the 2019 general elections.
“This year, we have retrieved over 700 voter cards from non-Nigerians.
“We will be there during elections to ensure that non-Nigerians don’t participate.
“We will make sure that they don’t vote and they are not voted for.
“During the election, we will ensure the borders are secured so that nobody can enter the country during the days of election.
“Immigration service has changed for the better.
“We have built the capacity of personnel and improved on structures and contributed to Nigeria’s security and prosperity in many ways,” Babandede said.