[3][4] On January 20, 2021, Sloan was expelled from the Conservative Party caucus after it was revealed that he had received a donation from white supremacist and perennial political candidate Paul Fromm.

[5] Party leader Erin O'Toole explained that the decision had been made "because of a pattern of destructive behaviour involving multiple incidents.

[9] In 2003, Sloan enrolled at Pacific Union College, a private university in Napa Valley, California associated with the Seventh-day Adventist Church.

[18] Sloan stated that were he elected leader he would permit Conservative MPs to reopen the debate on abortion or introduce private members’ bills aimed at overturning same-sex marriage.

[19] He also vowed to vote against a federal ban on the pseudoscientific practice of conversion therapy, arguing that parents should be able to make children identify with the body they are born with.

[21][3][22] On February 6, 2020, members of the Mohawks of the Bay of Quinte blockaded the Canadian National Railway north of Tyendinaga, in support the Wetʼsuwetʼen hereditary chiefs' opposition to the Coastal GasLink Pipeline within Sloan's riding of Hastings—Lennox and Addington.

[23] Three days later, Sloan characterized the protesters as "radical extremists" and called on the Ontario Provincial Police to enforce an injunction to remove the blockade.

[25] Conservative Party leader Andrew Scheer initially declined to comment on Sloan's remarks,[27] but stated that it was "inappropriate to question someone’s loyalty to their country" the following week.

[28] The municipality of Hastings County condemned Sloan's remarks as "cruel and racist" and unrepresentative of the people of his riding, before calling on him to be expelled from the Conservative Party.

[33] Shortly after Erin O'Toole won the leadership, Liberal MP Pam Damoff called for Sloan's expulsion from the Conservative caucus.

[34] Despite a petition launched by anti-abortion organization Campaign Life Coalition for his inclusion, O'Toole did not include Sloan in his Shadow Cabinet.

[35][36] During a campaign webinar on June 4, 2020, Sloan accused Justin Trudeau of "effectively putting into law child abuse" by proposing a ban on conversion therapy.

"Following his expulsion from the Conservative Party, Sloan has travelled across Ontario to speak at protests and demonstrations against public health measures enacted in response to the COVID-19 pandemic.

[47][48] On April 24, 2021, Sloan spoke at an anti-lockdown protest in Barrie where he recommended that the government explore treating COVID-19 using Vitamin D.[47] The following day Sloan, Ontario MPP Randy Hillier, and other demonstrators attended a service at the Church of God in Aylmer in defiance of the Reopening Ontario Act, which limits in-person religious gatherings to ten people.