U.S. Sen. Bill Nelson today accepted a CNN / Tampa Bay Times debate and one proposed by Leadership Florida jointly with the Florida Press Association.
Mack angered his lesser-known rivals in the GOP primary by refusing to debate them.
Republicans are hoping to help secure a majority in the Senate by unseating Nelson, who is seeking his third term.
The date, rules and format of the debates are undecided. Nelson campaign manager Pete Mitchell said he'd wait until after the Aug. 14 primary to address specifics.