PHOENIX — The Latest on an undecided Arizona congressional race (all times local):

3 p.m.

Lawyers for former internet executive Christine Jones have asked Arizona’s top prosecutor to investigate alleged anomalies in the tabulation of early ballots in the state’s Aug. 30 primary election for the 5th Congressional District.

Jones trails state Senate President Andy Biggs by 16 votes and state law requires a recount because of the small margin.

Her attorneys wrote a letter Monday to state Attorney General Mark Brnovich and Arizona Secretary of State Michele Reagan, saying the “number of over-votes in the CD5 election is unusually large” at 577 and should be checked out to ensure it wasn’t caused by machine error.

They also question “an unexplained drop in ballots tabulated from certain Chandler precincts” on Sept. 2 “including an entire region of Chandler that appears to be missing.”

Maricopa County officials have certified results from the primary election, a step toward a recount of the still-undecided race for the Republican nomination in a Phoenix-area congressional district.

The GOP primary winner will be favored to win the heavily Republican district’s open seat and replace retiring incumbent Matt Salmon.

10:55 a.m.

Maricopa County officials have certified results from Arizona’s Aug. 30 primary election, a step toward a recount of the still-undecided race for the Republican nomination in a Phoenix-area congressional district.

State Senate President Andy Biggs leads former internet executive Christine Jones by 16 votes in the 5th Congressional District, and state law requires a recount because of the small margin.

The county Board of Supervisors’ unanimous vote Monday approving the county canvass sends it to state officials who are expected to act later Monday on the statewide canvass.

A state official then will ask a judge for permission to hold the required recount, which would several days to conduct.

The GOP primary winner will be favored to win the heavily Republican district’s open seat.

Incumbent Republican Matt Salmon is retiring.

8:05 a.m.

Maricopa County and state officials plan Monday to certify results from Arizona’s Aug. 30 primary election, moves that would set the stage for a recount of the still-undecided race for the Republican nomination in a Phoenix-area congressional district.

State Senate President Andy Biggs leads former internet executive Christine Jones by 16 votes in the 5th Congressional District’s unofficial results.

State law requires a recount because of the small margin. It’s expected to take several days.

Biggs’ margin increased from eight votes after the county Friday counted 18 additional ballots under court order. Those ballots were cast by voters who weren’t told when they went to incorrect polling places that their provisional ballots wouldn’t be counted.

The GOP primary winner will be favored to win the heavily Republican district’s open seat.