For years, Donald Trump benefited from an informal court of influencers, podcasters and self-appointed power brokers who claimed unusual access to the former reality TV star. During his presidential campaigns and midterm election cycles, that ecosystem amplified Trump’s message and bypassed traditional Republican institutions. Now it’s colliding with the basic mechanics of governing and embarrassing the administration by creating a parallel power structure of clout chasers around the presidency. This week alone offered multiple remarkably different examples of the same phenomenon. In one, alleged pardon brokers sold access to Trump’s orbit as a luxury service. In another, one of Trump’s most...