Unfortunately, the only US president who tried to do something half-decent, JFK for wanting to abolish the CIA and giving an anti-imperialist speech titled “Imperialism: the Enemy of Freedom” to seemingly curtail the US's invasions in foreign countries, made himself an enemy of both the political parties, and was thus assassinated by the CIA.

Like I said, political systems in the imperial core, specially in the US, only really exist to protect capital, while giving a thin veneer of "democracy".

Seeing how the US gov has gone so far that it's committing a(nother) genocide, I personally expect any actual change to come from mass organization, pressure and agitation from organizations outside it forcing change, perhaps aided by existing ones like the FRSO or PSL. Ideally they'd overthrow this imperialist government altogether but hoping for that in the imperial core is probably being too wishful.