In this connection, it must also be noted that the decision to annul the election results should be taken as a last resort. Any violation of election rules should be susceptible to challenge as soon as it occurs. In particular, problems related to voter registration, candidate registration or access to the campaign should be resolved and such complaints should be decided before voting begins. Complaints about defects in the processes on election day, relating to election day procedures or vote counting, should, where possible, be resolved before the final verification of election results.