ST. LUCIE COUNTY -- Attorneys for Allen West said late Thursday they had discovered possible discrepancies after a review of early and absentee ballot information.
Nearly 1,000 votes may be in question, according to Tim Edson, Allen West for Congress campaign manager.
In a letter to Secretary of State Ken Detzner, attorneys said 110 early votes were cast in a precinct that didn't have enough early voters to support the number of votes cast.
Four hundred eighty-eight people cast early votes in precinct 28, they said, but election returns showed 499 early votes were counted.
Attorneys also raised concerns about 121 voters they said had returned absentee ballots but did not appear to have been assigned precinct.
West has refused to concede the race for the 18th Congressional district despite trailing Patrick Murphy, his Democratic challenger, by approximately 1,900 votes -- more than the .5% margin that would trigger an automatic recount.
Earlier, volunteer attorneys for West petitioned Detzner to conduct a preliminary investigation into the election and for a machine recount in three counties.
In a letter to Detzner, attorneys Mark Young and Jeffrey Scott Shapiro said 809 votes disappeared when the St. Lucie County Supervisor of Elections retabulated the final three days of early votes on Sunday.
Young and Shapiro said the missing votes, which accounted for 3.2% of the retabulated votes, amounted to an irregularity.
After the retabulation, West received a net increase of 535 votes over Murphy.
"On faith and belief, if this trend continues, for the remaining votes, the final outcome of the Congressional election could change," Yound and Shapiro said.
More than 330,000 votes were cast in the race.
West said he was 249 votes away from an automatic recount.
On Friday, a St. Lucie County judge will hear a request from West's attorneys to recount all of the early votes cast in St. Lucie County.