Getting illegal aliens off welfare and social security would shrink government.  Avoiding WW3 would shrink government.  Bringing troops home from Germany and Japan would shrink government.  Working with Russia to eliminate ISIS would ultimately save a lot of government resources which would otherwise be used in the fight against ISIS.  Going after the Mexican cartels which operate in most big cities would save a lot of police, military and intel resources, not to mention many lives.  In some states, a huge % of the budget is dedicated to education, health care, welfare, policing, trials, and incarceration of illegal aliens.  Pulling out of Afghanistan would eliminate the CIA's almost complete control of the world's heroin supply and the subsequent cost in dollars and lives here.  Allowing ObamaCare to collapse would shrink government.

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