"Voting irregularities" refers to any kind of problems or issues that occur during the process of voting. It can include things like mistakes, errors, or misconduct that may affect the fairness or accuracy of the election. Full definition
Just as Donald Trump made claims of election fraud before and after the vote, the far - right Freedom Party (FPÖ) of Mr Hofer made allegations of voting irregularities after an earlier run - off vote in May 2016. (blog.politics.ox.ac.uk)
Also a police investigation was launched into voting irregularities in the Daneshouse with Stoneyholme ward. (en.wikipedia.org)
I would reformulate the question to ask for general procedures and regulations upon a (potential) discovery of voting irregularities after the winning candidate has already been inaugurated. (politics.stackexchange.com)