Byrne became involved in politics at age 16 when she joined the Reform Party. Byrne's father, Jerry, had joined the same party to protest the Liberals' long-gun registry. Once referred to as "the most powerful woman in
Ottawa," Byrne has been called
Prime Minister Harper's "single best political organizer", a dedicated Harper loyalist who believed in the party during its darkest days. She is also known for her tenacity and possesses "a single-minded unwillingness to put up with people screwing around."
Stephen Harper's Conservative Party In 2009, she became the Director of Political Operations for the
Conservative Party of Canada following the appointment of
Doug Finley to the Senate of Canada. In August 2013, Byrne left her job as the Conservative Director of Political Operations and returned to the Prime Minister's Office as co-Deputy Chief of Staff.
Campaign manager for 2015 election In October 2014 the Conservative Party announced that Byrne would lead the campaign in the
2015 Canadian federal election. The Conservative government lost power to the Liberals, who won a majority of the seats. After the election, a number of Conservatives blamed Byrne for her role in the party's defeat and criticized her management style. Byrne's contract expired after the election. After the election, she joined Bayfield Strategy as vice-president of strategic communications.
Doug Ford's Progressive Conservative Party Following
Doug Ford's
election as leader of the
Ontario PC Party in March 2018, Byrne took over as Director of Field Operations for the
2018 provincial election. After the election, Byrne was selected to be Ford's first Principal Secretary. In February 2020 she launched Jenni Byrne + Associates, a government relations firm based in
Toronto.
Pierre Poilievre's Conservative Party As
Pierre Poilievre took leadership of the
Conservative Party of Canada in the
2022 Conservative Party of Canada leadership election, Byrne returned to the CPC to work for Poilievre. While her specific role in the CPC is simply that of an advisor, political commentators generally describe Byrne as Poilievre's right hand and chief strategist. Her role in Poilievre's campaign has created controversy because her consulting firm "Jenni Byrne + Associates" has multiple lobbyists registered on behalf of
Loblaws.
Loblaw Companies Limited has been central in discussions about the
inflation surge in Canada, including testifying in the
Parliament of Canada on the matter. Byrne served as the CPC's campaign manager for the
2025 Canadian federal election; the party was defeated by the
Liberal Party of Canada. Following criticism of her role in the campaign, Byrne announced that she would not serve in that role in the next election but would continue as an advisor to Poilievre. Prominent conservatives
Doug Ford,
Tim Houston, and
Kory Teneycke, have been particularly critical of the campaign. ==Media==