Donald Trump, whose populist message and promises to help American workers propelled him to the White House, is set to issue a budget proposal on Tuesday that instead takes aim at the social safety net on which many of his supporters rely.Rather than breaking with Washington precedent, Trump’s spending blueprint follows established conservative orthodoxy, cutting taxes on the wealthy, boosting defense spending and taking a hatchet to programs for the poor and disabled – potentially hurting many of the rural and low-income Americans that voted him into office.The budget proposal underscores the wide gulf between campaigning and governing, even for a president who promised to rewrite the presidential rulebook.The president’s budget plan calls for more than $1 trillion in cuts to wide-ranging social programs with millions of beneficiaries, from farm subsidies to federal student aid.