McCluskey's most striking move came on 20 June 2025, when he voted against the Terminally Ill Adults (End of Life) Bill at Third Reading — bucking a Labour majority that backed the bill. He also voted for New Clause 16, which would have barred people from accessing assisted dying if their motivation was substantially driven by disability, financial pressure, or fear of being a burden. His stance places him well outside the Labour centre of gravity on this issue: his voting profile shows 67% alignment with anti-assisted-dying positions, against a party average of 46%, and just 11% alignment with pro-access positions, compared to 58% across Labour.
Beyond assisted dying, McCluskey is a broadly loyal backbencher — 97.3% party-line voting — with participation at 77%, slightly below the Commons average. His speeches concentrate heavily on energy (46 debates) and cost-of-living (38 debates), reflecting the industrial and economic pressures facing Inverclyde. His stance profile shows strong alignment with workers' rights and progressive taxation, but low scores on civil liberties, parliamentary scrutiny, and Lords oversight, suggesting he prioritises economic intervention over constitutional checks.
On the ground, McCluskey has been visible in Inverclyde: he championed the £20m Greenock Regeneration Plan approved in March 2026, pressed health authorities over stalled repairs at the Inverclyde Royal Hospital, and logged 2,500 constituent casework cases securing over £164,000 in recovered entitlements. He holds no select committee seat, limiting his formal scrutiny role. Voting data covers his full term from July 2024; news coverage is drawn primarily from the Greenock Telegraph.