Green Party of Canada Leader Elizabeth May says her Saanich-Gulf Islands riding was one of those hit by the so-called robocall scandal during last year's federal election and she'd demanding the Commons hold an emergency debate on the issue.

May also alleges similar "voter suppression" tactics were used in the riding during the 2008 election and she wants to know who planned, programmed and paid for the calls.

Interim Liberal Leader Bob Rae says his party is now aware of 27 ridings affected by calls that directed voters to non-existent polling places -- the NDP says 29 ridings were targeted.

May is calling on the Speaker of the House of Commons to convene an emergency debate and Prime Minister Stephen Harper to order a probe, in addition to police and Elections Canada investigations already said to be under way.