Jack MacLaren

Since the Trillium Party lacked official party status in the Legislative Assembly of Ontario, MacLaren was officially considered an independent by the legislature. In the 2018 election he lost his bid for personal re-election in the new riding of Kanata—Carleton, coming in 5th out of seven candidates.

On May 28, 2017, Brown expelled MacLaren from the PC caucus, purportedly after a video recording surfaced of a 2012 speech in which he criticized French language rights in the province, and indicated that the party would act to limit them once in office. Brown also stated that MacLaren would not be allowed to run as a Tory in the next election. After his expulsion was announced, he released a statement on Twitter saying he had joined the Trillium Party of Ontario. MacLaren stated in an interview with the Toronto Star that he had already planned the week before to announce his move to the Trillium Party at a 3:30pm news conference on May 29, but Brown learned of his plans and expelled him first. Brown said that while there had been rumours of MacLaren leaving to potentially form his own party, Brown personally was unaware of MacLaren's plan to join the Trillium Party until after he found out about the video and expelled him.

The Toronto Star reported on March 3, 2016 that MacLaren had been making inquiries on behalf of challengers to MacLeod in her Nepean—Carleton riding. MacLaren refused to comment and the Progressive Conservatives dismissed the claims in the story. At the Ottawa party convention which was ongoing when the story broke, Brown publicly endorsed MacLeod's renomination as candidate.

MacLaren was forced to apologize on April 6, 2016 after calling his federal Liberal counterpart Karen McCrimmon to the stage at a cancer fundraising dinner the previous month in Carp, and then telling a vulgar joke about her and her husband's sexual relationship. MacLaren emailed an apology to McCrimmon after the story was first reported by the Toronto Star. The incident prompted criticism from across party lines, as fellow Progressive Conservative MPP Lisa MacLeod and federal Conservative MP Michelle Rempel both tweeted in support of McCrimmon. Patrick Brown said that the party had "zero tolerance for misogynistic comments and an apology was made correctly to Karen McCrimmon this morning."

On April 12, 2016, the Ottawa Citizen reported that MacLaren's website included a testimonials section praising his work where most of the constituents were fictional and were represented by photos that had been taken without permission from the internet. One of the testimonials was from a "Robert & Karen" from Constance Bay, which coincidentally is where MacLaren's federal counterpart, Liberal MP Karen McCrimmon lives with her husband Robert. MacLaren's website initially added a disclaimer claiming that the names and depictions of constituents had been changed to protect their privacy before removing the page entirely. MacLaren then issued an apology for the improper use of constituent testimonials and had his website taken offline.

On May 31, 2016, MacLaren returned to Queen's Park after completing his sensitivity training.

MacLaren was the second MPP to back former federal Conservative Patrick Brown's successful bid for leadership in the 2015 Progressive Conservative leadership election, bringing with him the supporter of the small but dedicated Ontario Landowners Association

In June 2015, MacLaren was accused of betraying social conservative values by Nick Vandergragt, a conservative radio talk show host on Ottawa's CFRA for marching in that year's Toronto Pride parade alongside PC leader Patrick Brown and other conservatives, both federal and provincial.

MacLaren was named his party's Critic for Natural Resources and Forestry on September 10, 2015, as well as the Vice-Chair of the relevant committee. Brown also made MacLaren, a libertarian, the chairman of the PC's Blue Ribbon Panel on Property Rights. Also in Fall 2015, Brown chose MacLaren to replace fellow Ottawa PC MPP Lisa MacLeod as the party's critic for Eastern Ontario.

On November 26, 2015, MacLaren officially invited a "group of friends and guests" from the Tamil community to hear him make a speech in Queen's Park about the "genocidal onslaught for the Tamils" in Sri Lanka. A week after the speech, the National Post reported that the delegation selected by the Tamil community had included M. K. Eelaventhan, a Tamil politician that the Canada Border Services Agency is trying to deport from Canada for his previous connections to the Tamil Tigers, which is recognized by Canada as a terrorist organization.

He was re-elected in the June 2014 provincial election defeating Liberal candidate Rosalyn Stevens by 10,029 votes. On July 4, 2014, it was announced that MacLaren would continue be the party's critic for Senate and Democratic Reform.

In November 2014, MacLaren introduced a private member's bill to repeal the law that grants environmental protections for the Niagara Escarpment for the second time. The bill was named for a late friend of MacLaren's named Bob Mackie who was fighting to prevent the closure of an illegal archery range on his property on the escarpment. MacLaren said that his bill would begin to reverse "the tide of creeping socialism that has been slowly taking away our property rights for decades" and that it would restore the values of "our British Christian cultural heritage of freedom, democracy, common-law and private property rights that date back to the Magna Carta of 1215." Most PC MPPs either stayed away from the chamber during the vote, which was 40–1 defeat of the bill, but some whose ridings included parts of the escarpment, such as Sylvia Jones, Ted Arnott, and former leader Tim Hudak, stayed to vote against it.

In 2011, MacLaren contested the party's nomination in the riding of Carleton—Mississippi Mills competing against the sitting MPP Norm Sterling, who had represented the riding and its predecessors in Queen's Park for 34 years. MacLaren won the nomination with the help of one of Sterling's fellow MPPs, Randy Hillier. Hillier, who was also a past president of the Ontario Landowners Association, campaigned on behalf of MacLaren.

In the 2011 provincial election, MacLaren defeated Liberal candidate Megan Cornell by about 9,102 votes. In the 40th Parliament of Ontario, MacLaren served as his party's deputy critic for infrastructure and transportation from October 26, 2011 to September 30, 2013, when he was promoted to be his party's critic for Senate and Democratic reform.

Jack MacLaren (born c. 1951 ) is a Canadian former politician who represented the eastern Ontario riding of Carleton—Mississippi Mills in the Legislative Assembly of Ontario from 2011 to 2018. Originally elected as a member of the Progressive Conservative Party of Ontario, he was removed from the party's legislative caucus in 2017 by party leader Patrick Brown after a video recording surfaced of him suggesting that the party would repeal Franco-Ontarian language rights in the province. MacLaren announced later that day that he had joined the Trillium Party of Ontario, becoming that party's first MPP.

MacLaren was born in Woodlawn, Ontario in 1951. He is a past president of the Ontario Landowners Association and graduated with a BSc in civil engineering from Queen's University in 1972.