Democrats’ coming control of Congress shifts leverage toward oversight, putting the Iran war, defense leadership and federal grant rules in focus.
Democrats’ midterm victories will soon place both chambers of Congress under opposition control. The immediate tests are taking shape around the Iran war, Defense Secretary Pete Hegseth and federal grant rules—disputes that reach beyond politics to the limits of presidential authority.
The new Congress convenes January 3, 2027. Until then, Democrats do not control committee gavels or chamber agendas. Once they do, their strongest leverage is likely to be oversight: demands for records, subpoenas and hearings. President Donald Trump retains his veto, so major legislation will require bipartisan agreement or veto-proof support. Divided government may stall new laws, but it does not automatically stop the executive branch from acting under existing authority.
The war is already dividing Republicans. Vice President JD Vance publicly attributed the election defeat to the conflict, writing, “The reason we lost is the war,” and arguing that any post-election reckoning must begin there. Trump, by contrast, said Hegseth will remain defense secretary and praised his performance as “a great job.” Pentagon spokesman Sean Parnell said Hegseth intends to serve through the end of Trump’s term.
Republican Rep. Thomas Massie plans to force a House impeachment vote when Congress returns next week. Multiple Republican sources told CNN they expect the measure to pass. The Deep Dive reported Massie is expected to reintroduce eight articles unless Hegseth resigns. A House vote would be a major political rebuke, not removal from office; that would require a Senate conviction. Available reporting does not establish how the Senate would act.
Democrats are preparing possible subpoenas on the Iran war, the legality of strikes on suspected drug-smuggling boats and Hegseth’s unexplained firings of senior military officers, ABC News reported. BBC reporting identifies possible inquiries into civilian casualties, munitions shortfalls, spending and allegations involving inadequately prepared troops and facilities. These are potential investigative subjects, not established findings. Oversight can compel answers, but does not by itself prove an action unlawful.
A quieter dispute over federal grants also puts Congress’s authority in play. More than 100 organizations, including the Association of American Universities and the American Association for the Advancement of Science, warned Congress on November 5 that proposed rules could give political appointees greater control over grants and allow cancellations when projects do not align with presidential priorities. The Office of Management and Budget received at least 164,000 comments; the broad rule cannot be finalized before mid-December, Inside Higher Ed reported.
The organizations argue that agencies could override Congress’s funding instructions, including language in a September temporary funding measure. The question turns on the rule’s text and the appropriations Congress enacted. If agencies use grant conditions to redirect money lawmakers allocated, Congress has a direct institutional stake. If the rule stays within authority delegated by Congress, the issue is how much discretion that delegation allows.
Incoming House Oversight Chairman Robert Garcia has named Trump family businesses, immigration enforcement, corporate donations connected to the White House ballroom and the Epstein files as potential investigative targets. Democrats are also preparing inquiries into military decisions. These are announced priorities, not findings of misconduct.
The election narrows the administration’s legislative path and may increase its reliance on executive authority. Such actions remain subject to statutory limits, court review and congressional scrutiny. The coming contest will turn on the authorities, records and appropriations behind decisions—not on how either side describes them.

