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delivered the opinion of the Court.

In each of these two cases, the respondent in an administrative enforcement action challenges the constitutional authority of the agency to proceed. Both respondents claim that the agencies’ administrative law judges (ALJs) are insufficiently accountable to the President, in violation of separation-of-powers principles. And one respondent attacks as well the combination of prosecutorial and adjudicatory functions in a single agency. The challenges are fundamental, even existential. They maintain in essence that the agencies, as currently structured, are unconstitutional in much of their work.