The investigation, which is said to center on renovations of the Federal Reserve’s headquarters in Washington, is an escalation of the president’s long-running pressure campaign on Jerome H. Powell.

Powell took the unprecedented step of responding publicly to the news, and the inquiry sparked criticism from many Democrats and even some Republicans. Here are the most notable reactions. Powell has taken pains not to engage directly with President Trump’s many personal insults directed at him in recent months.

Federal Reserve Chair Jerome Powell reveals a criminal investigation and grand jury subpoenas linked to his testimony on Fed matters, framing the move as political pressure from the Trump administration.

Criminal probe of Fed Chair Powell over building costs triggers GOP revolt, with key senators threatening to derail Trump's central bank appointments.

Federal Reserve Chair Jerome H. Powell issued a public statement Sunday evening after the Department of Justice (DOJ) served the Federal Reserve with grand jury subpoenas that could lead to criminal charges tied to his June testimony before the Senate Banking Committee.