Georgia Republicans are vowing to sue the Democratic stronghold of Fulton County after it announced extended elections office hours on Friday.The threat came after the state GOP learned that election officials in the county, which includes Atlanta, are planning to open four election offices this weekend ‘to accommodate voters seeking to hand-return their absentee ballots.'"This is a blatant violation of Georgia law . . . which states ‘all drop boxes shall be closed when the advance voting period ends,’" the Georgia GOP said in a statement late on Friday.Fulton County is expected to be key to Democrats’ chances of winning