> He is fulfilling his declared policy objective ...his actions are basically US (majority) people's collective action.

Process matters and laws matter. The federal budget is set by congress. If the executive branch is allowed to unilaterally withhold or redirect money then what is the point of congressional budgetary authority? If they had won a super majority then they would have also been able to pass whatever laws/budgets/etc. through congress (assuming they're constitutional).

People are not just objecting to what they're doing, but how they're doing it.

> Trump declared certain policies in his election campaign.

Trump declared directly contradictory policies, depending on who he was talking to, and publicly disavowed the Project 2025 stuff that was widely unpopular. (Then, hired its planners and implemented their policies.)

Trump received a plurality of the vote, not a majority.

You keep using majority as emphasis, but that's incorrect. Trump only got 49.8% of the vote. The majority of America voters did not vote for him.