New Democratic Party Leader John Horgan passes a drawing of former NDP leader Jack Layton before speaking to the media following the opening of the 41st Parliament of British Columbia, at the legislature buildings in Victoria, B.C., Canada June 22, 2017. REUTERS/Kevin Light 

Canada's New Democratic Party (NDP) leader Tom Mulcair and his wife Catherine (C) greet Olivia Chow, wife of former NDP leader Jack Layton, at a campaign event in Toronto, Ontario, Canada, October 18, 2015. REUTERS/Jim Young

Canada's New Democratic Party (NDP) leader Tom Mulcair greets Olivia Chow, wife of former NDP leader Jack Layton, at a campaign event in Toronto, Ontario, Canada, October 18, 2015. REUTERS/Jim Young

Canada's New Democratic Party (NDP) leader Tom Mulcair and his wife Catherine (C) greet Olivia Chow, wife of former NDP leader Jack Layton, at a campaign event in Toronto, Ontario, Canada, October 18, 2015. REUTERS/Jim Young

Canada's New Democratic Party (NDP) leader Thomas Mulcair and his wife Catherine speaks to former leader Jack Layton's sister, Nancy Layton (L), at a campaign event in Sherbrooke, Quebec, Canada, October 15, 2015. REUTERS/Jim Young

Olivia Chow hugs her late husband Jack Layton's son Mike Layton at a press conference in Toronto where she officially announced she will run for Mayor of Toronto March 13, 2014. REUTERS/Fred Thornhill (CANADA - Tags: POLITICS) 

Tristan Layton hangs Union Jack flags from the ceiling of the British themed restaurant Tea & Sympathy in preparation for celebrating the birth of the royal baby in New York, July 22, 2013. Prince William's wife Kate was in labour at a London hospital on Monday as public anticipation over the birth of their first child, who will be third in line to the British throne, reached fever pitch. REUTERS/Lucas Jackson (UNITED STATES - Tags: ROYALS ENTERTAINMENT HEALTH) 

Hayley Simmonds (L) and Tristan Layton hang Union Jack flags from the ceiling of the British themed restaurant Tea & Sympathy in preparation for celebrating the birth of the royal baby in New York, July 22, 2013. Prince William's wife Kate was in labour at a London hospital on Monday as public anticipation over the birth of their first child, who will be third in line to the British throne, reached fever pitch. REUTERS/Lucas Jackson (UNITED STATES - Tags: ROYALS ENTERTAINMENT HEALTH) 

A bobble-head doll of former New Democratic Party leader Jack Layton sits on a table at the NDP Convention in Montreal , Quebec, April 12, 2013. REUTERS/Christinne Muschi (CANADA - Tags: POLITICS) 

Ottawa city councillor Alex Cullen attends a vigil for former New Democratic Party leader Jack Layton on Parliament Hill in Ottawa August 22, 2012. Layton died on August 22, 2011. REUTERS/Blair Gable (CANADA - Tags: POLITICS ANNIVERSARY) 

New Democratic Party supporter Meera Chander attends a vigil for former NDP leader Jack Layton on Parliament Hill in Ottawa August 22, 2012. Layton died on August 22, 2011. REUTERS/Blair Gable (CANADA - Tags: POLITICS) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair gestures as he meets with his new caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair smiles during a meeting with his caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS HEADSHOT) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair speaks during a meeting with his caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS HEADSHOT) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair gestures as he meets with his new caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair smiles beside former interim-leader Nycole Turmel (L) as he meets with his new caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair waves beside former interim-leader Nycole Turmel (L) as he meets with his new caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair gestures as he meets with his new caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair is embraced by MP Olivia Chow as he arrives at a meeting with his caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS) 

Newly elected New Democratic Party (NDP) Leader Thomas Mulcair arrives with chief of staff Anne McGrath to meet his new caucus in Toronto March 25, 2012. Mulcair succeeds former NDP Leader Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS) 

Leadership candidate Thomas Mulcair (L) gestures beside his wife Catherine Pinhas after winning the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton, who passed away past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Brian Topp embraces a supporter while waiting for the results of the final ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton, who passed away past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) reacts with interim-leader Nycole Turmel after winning the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) embraces his wife Catherine Pinhas after winning the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away last summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) gestures beside his wife Catherine Pinhas after winning the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair is congratulated by former Leader Jack Layton's widow, MP Olivia Chow (L) after winning the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) kisses his wife Catherine Pinhas after winning the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) gestures beside his wife Catherine Pinhas after winning the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

A delegate rests between ballots during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (R) kisses his wife Catherine Pinhas after the results of the third ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (R) reacts beside his wife Catherine Pinhas after the results of the third ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

A delegate wears buttons from several candidates during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Brian Topp and former NDP Leader Ed Broadbent (L) celebrate as they wait for the results of the third ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

A delegate rests between ballots during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Stephen Wise wears a top hat in support of Leadership candidate Brian Topp during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

A delegate waits for her electronic vote to be accepted at a computer terminal during the third ballot at the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Peggy Nash speaks to reporters while waiting for results of the second ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Nathan Cullen wipes his head while waiting for the results of the second ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) and his wife Catherine Pinhas react with supporters after the results of the second ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair waves after the results of the second ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) and his wife Catherine Pinhas react with supporters after the results of the second ballot during the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Brian Topp votes during the second ballot at the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

NDP interim-leader Nycole Turmel waves to delegates after speaking at the NDP Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Nathan Cullen arrives with his family for the reading of the first ballot results during the New Democratic Party (NDP) Leadership Convention in Toronto March 24, 2012. The NDP is electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Results of the first ballot are shown on the main stage during the New Democratic Party (NDP) Leadership Convention in Toronto March 24, 2012. The NDP is electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Martin Singh (R) joins Thomas Mulcair after the results of the first ballot during the New Democratic Party (NDP) Leadership Convention in Toronto March 24, 2012. The NDP is electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) and his wife Catherine Pinhas cheer with supporters after the results of the first ballot during the New Democratic Party (NDP) Leadership Convention in Toronto March 24, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (L) and his wife Catherine Pinhas cheer with supporters after the results of the first ballot during the New Democratic Party (NDP) Leadership Convention in Toronto March 24, 2012. The NDP is electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Thomas Mulcair (front C) and his wife Catherine Pinhas cheer with supporters during the New Democratic Party (NDP) Leadership Convention in Toronto March 24, 2012. The NDP is electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Sarah and Mike Layton speak during a tribute to their late father and New Democratic Party (NDP) leader Jack Layton during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

New Democratic Party (NDP) Member of Parliament Olivia Chow speaks during a tribute to her late husband and NDP leader Jack Layton during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

New Democratic Party (NDP) Member of Parliament Olivia Chow speaks during a tribute to her late husband and NDP leader Jack Layton during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

New Democratic Party (NDP) Member of Parliament Olivia Chow speaks during a tribute to her late husband and NDP leader Jack Layton during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

New Democratic Party (NDP) Member of Parliament Olivia Chow speaks during a tribute to her late husband and NDP leader Jack Layton during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Delegates watch a video tribute to former leader Jack Layton during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Interim Leader Nycole Turmel casts her ballot during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Martin Singh speaks to delegates during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Martin Singh speaks to delegates during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Niki Ashton speaks to delegates during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS) 

Leadership candidate Peggy Nash speaks to delegates during the NDP Leadership Convention in Toronto March 23, 2012. The NDP are electing a new leader to replace Jack Layton who passed away this past summer. REUTERS/Mike Cassese (CANADA - Tags: POLITICS ELECTIONS)