The U.S. Department of Justice announced on Monday that its employees will visit polling places in Collier, Hendry, Lee, Osceola and Polk counties during Tuesday's primary election.
Department observers will check to make sure county election workers are following federal election laws.
The agency stated that those five counties are required to provide language assistance in Spanish.
Collier and Lee recently carried out a purge of potential non-U.S. citizens from its voting rolls even though other counties raised questions about the accuracy of a list put together by state officials.
The U.S. Department of Justice recently sent subpoenas to nine counties seeking information about how counties handled the state push to identify and remove potentially ineligible voters.