Blackman serves on the Procedure Committee, the Backbench Business Committee and the Housing, Communities and Local Government Committee. Blackman supported Brexit in the 2016 referendum. He subsequently joined the European Research Group, a Eurosceptic group within Parliament. Blackman is an officer of the Conservative Friends of Israel group. He has been part of several delegations to Israel, including during the Operation Defensive Shield conflict when he visited for an Israeli military briefing on the Iron Dome defence system. In 2015, the compliance officer for the Independent Parliamentary Standards Authority (IPSA) made a judgement that Blackman had submitted 732 inaccurate mileage claims. According to IPSA he claimed up to 10 miles for a two-mile journey, making him the highest-mileage MP, claiming almost twice the mileage as the 10 next-highest MPs. In 2017, Blackman drew criticism from Tom Peck of The Independent for hosting Tapan Ghosh, an anti-Islam extremist from India, at a House of Commons event in October 2017. Blackman also shared anti-Islam posts on Twitter by far-right activist Tommy Robinson and was a member of various anti-Islam groups on Facebook. These comments and others by some Conservative candidates and representatives led the Muslim Council of Britain to call for an independent inquiry into alleged Islamophobia in the Conservative Party. In March 2019, Blackman was among a group of MPs who argued for a number of measures to encourage people to quit smoking and prevent young people from taking it up, including raising the legal smoking age to 21 and introducing a levy on large tobacco companies. In August 2019, Blackman expressed his support for Indian Prime Minister Narendra Modi revoking Article 370 of the Constitution of India, calling the article an "anomaly", adding that "Kashmiri Pandits must be guaranteed right of return after they were the victims of ethnic cleansing". Azerbaijan All-Party Parliamentary Group Blackman is the chair of the Azerbaijan All-Party Parliamentary Group (APPG). In 2013, The Guardian published an article "Plush hotels and caviar diplomacy: how Azerbaijan's elite wooed MPs", criticising, among other British MPs, Blackman's five-day visit to Azerbaijan, paid for by The European Azerbaijan Society (TEAS). The National highlighted in 2022 that several of his trips to Azerbaijan were paid for by the Azerbaijani parliament or its London embassy. Blackman received a series of briefings from high-level Azerbaijani figures, including in 2020 and 2021 from Azerbaijani MP Javanshir Feyziyev, who was investigated by the National Crime