Todd Blanche, the acting attorney general, has tried to tread an ever-narrowing path between his role as a top Justice Department official and the job that got him there in the first place — as President Trump’s doggedly loyal former lead defense lawyer.

Allies of Mr. Blanche thought he could achieve two seemingly irreconcilable goals when he was elevated to temporarily replace Pam Bondi after her ouster in April: restoring stability and competence to the department and taking a handful of actions that were sufficiently drastic to convince the boss he was tough enough to make his title permanent.

So far, however, Mr. Blanche has exhibited few of the modest moderating tendencies he exhibited during more than a year as Ms. Bondi’s top deputy. Under Mr. Blanche, the pace of investigations against Mr. Trump’s perceived enemies has accelerated — most strikingly, the indictment of the former F.B.I. director, James B. Comey, for posting on social media an image of seashells that prosecutors cast as threatening. Mr. Blanche has used his new perch to boost debunked election conspiracy theories promoted by the president.

But the moves that most starkly illustrated Mr. Blanche’s evolving approach came this week. In announcing on Monday a $1.8 billion fund that would benefit those who claim they were targeted by the federal government, he effectively forged a pipeline to funnel taxpayer money to Trump allies, among them supporters who ransacked the Capitol on Jan. 6, 2021. “The machinery of government should never be weaponized against any American, and it is this department’s intention to make right the wrongs that were previously done while ensuring this never happens again,” Mr. Blanche said in a statement.

It was instantly labeled a “slush fund” by Democrats. The head of one prominent good-government group described the plan as “one of the single most corrupt acts in American history.”

Then came a stealthy stunner. The department inserted a supplement to the fund agreement that granted Mr. Trump, his family and their businesses immunity from ongoing inquiries into their taxes, an extraordinary move that could shield the president from significant financial liability — issued under Mr. Blanche’s signature.