Detzner, who is Gov. Rick Scott's chief elections officer, said Miami-Dade is one of five Florida counties his staff will make fact-finding visits to next week.
Referring to Miami-Dade Mayor Carlos Gimenez, Detzner said: "The mayor gets it. He knows what the problem is in Dade County and how to solve the problem."
Testifying before the Senate Ethics and Elections Committee, Detzner said the "problem" could be anything from a lack of early voting sites to a lack of money for office operations.
Detzner said the problem os "underperformance" will also be investigated in Broward, Palm Beach, St. Lucie and Lee counties. He said he would report all of his findings to Gov. Rick Scott in January.