Former Liberal MP Borys Wrzesnewskyj is in court this week, challenging the 2011 election results in the Toronto riding of Etobicoke Centre.
The race was close. Wrzesnewskyj lost to Conservative Ted Opitz by only 26 votes.
When voting irregularities came to light in the aftermath of the election result, Wrzesnewskyj decided to head to Ontario Superior Court asking for the result to be overturned. Elections Canada is opposing his arguments, as is Opitz, now the sitting MP.
Testimony continues Thursday with Opitz's lawyer Tom Barlow up next, arguing against overturning the result.
The CBC's Leslie MacKinnon is in court, reporting on the proceedings live via Twitter.
Mobile-friendly coverage available here.