[9] In November 2018, Jim Karahalios ran for the presidency of the Ontario Progressive Conservative Party and later filed a lawsuit against the party after his defeat, alleging the election process was manipulated, election rules were breached and that ballot boxes were allegedly stuffed in order to elect his competitor, Brian Patterson, who was endorsed by Doug Ford.

[10] On July 21, 2020, Belinda Karahalios was expelled from the Progressive Conservative caucus by Doug Ford after voting against Bill 195, the Reopening Ontario (A Flexible Response to COVID-19) Act, which would expand the government's emergency authority during the COVID-19 pandemic.

"[11][12] A month later, Belinda Karahalios, her husband Jim, and 18 other members of the Ontario PC Party were removed from the Cambridge PC Riding Association Board as a result of the party executive, led by Brian Patterson, voting to "de-register" the riding association with Elections Ontario.

[16] Belinda Karahalios, an independent after having been removed from the PC caucus, became the lone MPP for the New Blue Party as of January 18, 2021.

[17] Karahalios ran as a New Blue candidate in the 2022 provincial election, but lost her seat, coming in fourth.