Subpoenas Are Coming: Washington Law Firms Brace for a Probe Boom

Nine major law firms collectively pledged $940 million in free legal services to Donald Trump, and in January those commitments may acquire a new legal significance: targets of congressional subpoenas. Democrats won both chambers of Congress in the November elections. They take control — and with it, subpoena power — when the new session convenes in January 2026.

The prediction comes from practitioners who have worked inside the machinery they now advise clients about. Brian Nieves, a partner at Holtzman Vogel and former deputy counsel to the House Oversight Committee, told Reuters: "Congressional investigations will be the busiest area of law in Washington over the next two years."

That is a striking forecast for a town that never lacks for legal work. It suggests the coming cycle of oversight will outpace even the usual post-transition burst of hearings, document demands, and witness preparation.

Who said what, and why it matters?

Reuters surveyed Washington practices preparing for the shift, and the resulting comments read like a market forecast for subpoenas. Three assessments stand out:

• Mark Epley, who co-leads Arnold & Porter's congressional investigations practice, offered a blunt summary: "Bottom line, there will be more investigators and more investigations."
• Susanne Sachsman Grooms of Cooley warned that the volume of probes could double relative to recent levels.
• Rep. Robert Garcia, the incoming Democratic chair of the House Oversight Committee, previewed his agenda for prospective targets in two words: "Lawyer up."

A doubling of investigative volume, if it materializes, would mean roughly twice the document requests, twice the deposition notices, and twice the privilege disputes that Washington's congressional-investigations bar handled in the recent period. Firms that built capacity for the last oversight wave may find it insufficient.

What does the change in control actually deliver?

Committee subpoenas follow the gavel. Democrats, having taken both chambers, will hold chairmanships and the subpoena authority those positions carry beginning in January. They have already signaled their intended targets: the Trump administration, its allies, and companies that conducted business with them.

The nine firms that agreed to provide the $940 million in pro bono legal services to Trump sit near the top of the potential target list. Those arrangements, negotiated under pressure during the prior administration, are now the subject of anticipated congressional scrutiny. For the firms involved, the practical exposure is twofold: their deals may be examined directly, and their client relationships with companies that did business with the administration may draw secondary attention.

What should practitioners do now?

The practical consequence for the investigations bar is a capacity problem and a conflicts problem at once. Clients will need rapid-response counsel for document preservation, subpoena compliance, and witness preparation — work that scales poorly because it demands senior lawyers with committee experience. Epley's observation that there will be "more investigators" matters here: larger committee staffs generate more inquiries in parallel, and each inquiry carries its own deadlines.

Firms on the target list face a separate calculus. Their $940 million in aggregate commitments may be scrutinized for the circumstances of the deals, and their lawyers may be witnesses as well as counsel. That is an uncomfortable position for any firm. It is more uncomfortable still when the committee doing the asking has subpoena power and a chair who has already advised, in public and in two words, that the target population should retain counsel.

The takeaway, in plain words: Washington's investigations practices expect a doubling of work, nine firms expect scrutiny of $940 million in Trump commitments, and everyone involved expects subpoenas in January.