UPDATE 5/26/16 @ 1:55 p.m.

FRANKFORT, Ky. (WSAZ/AP) -- A review of election results has not changed the outcome of Kentucky's Democratic presidential primary.

Hillary Clinton leads Bernie Sanders by just under 2,000 votes, or less than one half of 1 percent of all votes cast. Both candidates earned 27 delegates in the May 17 primary. But one delegate in the 6th Congressional District has not been awarded yet. Clinton leads Sanders by about 500 votes in that district.

"I’m grateful to our county boards of elections for their work today. Their efforts help ensure confidence in the Primary Election results for both candidates and the electorate," said Kentucky Secretary of State Alison Lundergan Grimes. "The recanvass results did not alter the outcome of the election."

Sanders could ask a judge to order a recount, but he would have to pay for it himself. The deadline to ask for a recount is Friday.

Clinton leads Sanders by a margin of 271 pledged delegates. But Sanders has vowed to stay in the race.

UPDATE 5/26/16 @ 10:10 a.m.

FRANKFORT, Ky. (AP) - State election officials will re-examine vote totals from the Democratic presidential primary at the request of Bernie Sanders' campaign.

At stake is one delegate in the race for the Democratic presidential nomination. Sanders and Hillary Clinton both picked up 27 delegates after the May 17 Kentucky primary. But one delegate is yet to be awarded from the 6th Congressional District.

Sanders trails Clinton by 500 votes in that district. State officials review absentee votes and totals from electronic voting machines on Thursday. If the recanvas shows Sanders earned more votes than Clinton in the district, he could win that delegate who would otherwise go to Clinton.

The recanvass begins at 9 a.m. EDT, with results expected by mid-afternoon. Overall, Sanders trails Clinton by 271 pledged delegates.

ORIGINAL STORY 5/24/16

ANAHEIM, Calif. (AP) - Bernie Sanders' presidential campaign is requesting a recanvass in Kentucky's presidential primary, where he trails Hillary Clinton by less than one-half of 1 percent of the vote.

The Sanders campaign says it will ask the Kentucky secretary of state to have election officials review electronic voting machines and absentee ballots from last week's primary in each of the state's 120 counties.

Clinton holds 1,924-vote lead over Sanders out of 454,573 votes cast. The Associated Press had not called the race, despite Clinton's slight lead, in the event that Sanders might ask to recanvass the vote.

A recanvass is not a recount but a review of the voting totals.

Both Clinton and Sanders received 27 delegates, but one delegate remains to be allocated in a congressional district that includes Frankfort and Lexington.