Some 30,000 absentee ballots in Milwaukee need to be recounted, likely delaying the results in the key swing state of Wisconsin, election officials said.

Republican Sen. Ron Johnson raised concerns about the 31,000 absentee ballots the City of Milwaukee said it began recounting Tuesday afternoon after election officials were made aware that doors covering on-off switches on some of the machines used to tally those votes had not been properly closed.

From the polling place to the courtroom, ABC News tracks the latest election security developments as experts warn about the spread of misinformation and disinformation from within the U.S. and abroad.