Shadow Portfolio — 1 April 2026

Senator McKenzie used 1 April Senate proceedings to prosecute three distinct opposition lines — fiscal accountability on fuel excise, agricultural community protection in the Murray-Darling Basin, and community resistance to gun law changes — each targeting a different dimension of the government's legislative agenda.

The most politically charged intervention concerned the Treasury Laws Amendment (Fuel Excise Relief) Bill 2026. Senator McKenzie told the Senate that the Opposition had presented the government with a costed proposal to temporarily halve fuel excise for three months, paired with a matching reduction in the heavy vehicle road user charge, and fully offset by budget savings to avoid inflationary pressure.

The government adopted the policy concept after a three-day delay — a delay during which, Senator McKenzie calculated, the government collected an additional $50 million in revenue from drivers and truckies [TA-260331-senate-32a8f9c5c8fe:s139]. The Opposition's central critique is that the government's version departed from the design in a critical respect: it carries no commensurate budget savings, rendering it a $2.5 billion unfunded commitment that Senator McKenzie argued would create rather than relieve inflationary pressure [TA-260331-senate-32a8f9c5c8fe:s139].

The bill further delegates to the Treasurer authority to alter the excise rate over three months without returning to parliament — a power Senator McKenzie characterised as evidence the government lacks a coherent crisis response plan [TA-260331-senate-32a8f9c5c8fe:s139]. She also cited media reports of private Labor backbench concern, with members reportedly characterising the measure as a dangerous precedent and expressing surprise at the Prime Minister's decision to adopt Opposition policy.

Despite all of this, the Opposition will support the bill. Senator McKenzie used the occasion to call for a Senate select committee to examine the government's broader response to the Middle East crisis, pointing to what she described as four weeks of initial flat-footedness, ad hoc policy design, and economic impacts projected to span years [TA-260331-senate-32a8f9c5c8fe:s139].

The second major intervention was Senator McKenzie's introduction of the Commonwealth Environmental Water Holder Commission of Inquiry Bill 2026, which proposes a term-limited, targeted commission to examine the implementation and impacts of the Murray-Darling Basin Plan [TA-260401-senate-1301079c9e7f:s009]. Senator McKenzie argued that Basin Plan water buybacks have decimated agricultural communities and produced environmental damage rather than the benefits the government claims, citing the Barmah Choke as a specific example of declining river health.

She also disputed the status of the 450 gigalitre additional water recovery, asserting it was a side arrangement — not part of the original agreement — that required proof of no social, economic, or environmental damage before any removal could proceed [TA-260401-senate-1301079c9e7f:s009]. The Opposition frames the inquiry as giving basin communities a direct voice in an evidence-based examination of policy alternatives, positioning the Labor government and Greens as having subordinated river health, community sustainability, and agricultural viability to volumetric gigalitre targets [TA-260401-senate-1301079c9e7f:s009].

Separately, Senator McKenzie tabled a non-conforming petition carrying 3,607 additional signatures opposing the government's gun law changes, bringing the cumulative total to over 70,000 signatories [TA-260401-senate-1301079c9e7f:s093]. The tabling serves as a running measure of organised community opposition on that issue.

Across the day, Senator McKenzie's activity reflects a coherent opposition posture: claim policy authorship on fuel excise while attacking the government's fiscal execution of it; advance a structural accountability mechanism (the Basin inquiry) to contest water policy; and keep community-petition pressure visible on gun laws. The fuel excise and Basin interventions share an underlying theme — the Opposition presenting itself as the source of disciplined, costed policy design against a government characterised as reactive, unfunded, and structurally improvised.