WASHINGTON — U.S. Defense Secretary Pete Hegseth is preparing to face a more assertive Congress when the newly elected lawmakers take office in January 2027, with Democrats expected to use their incoming majorities in the House and Senate to intensify scrutiny of the Pentagon’s leadership, military operations and spending decisions.
The change in congressional control follows the Democrats’ sweeping victories in the November 2026 midterm elections. The new Congress is scheduled to convene on January 3, 2027. Until then, Republicans retain control of the current Congress, leaving Hegseth with a limited period before the balance of power on Capitol Hill changes.
The coming transition has placed the Pentagon chief at the centre of a widening political and institutional dispute. Democratic lawmakers have signalled plans to investigate the administration’s handling of the war with Iran, military strikes against alleged drug-trafficking vessels, changes in senior military leadership and the department’s approach to defence contracts. Some have also raised the possibility of another impeachment effort.
Impeachment Bid Blocked, But Scrutiny Continues
Hegseth received a temporary reprieve on November 10 when the Republican-controlled House voted 211–204 to refer articles of impeachment introduced by Representative Thomas Massie to committee. The procedural move effectively halted the immediate effort to bring the resolution to a full House vote before the current Congress expires.
The resolution accused Hegseth of misconduct connected to his handling of military operations and the Iran conflict. Its defeat did not resolve the underlying disputes, and it does not prevent the next Congress from pursuing separate investigations or considering a new impeachment resolution. NPR reported that Democrats have promised vigorous oversight once they assume the majority in January.
Democratic leader Hakeem Jeffries, who is expected to become House speaker, has publicly supported efforts to remove Hegseth. However, impeachment and removal are separate constitutional stages: the House can impeach by a simple majority, while conviction and removal by the Senate require a two-thirds vote. Even with Democrats controlling both chambers, that Senate threshold would remain a major obstacle unless substantial bipartisan support emerged.
Iran War Likely To Be A Major Focus
One of the most consequential areas of scrutiny will be the administration’s military campaign against Iran. The conflict has continued for months, generating questions about its objectives, cost, legal basis, civilian consequences and the extent to which Congress was consulted or authorised the use of force.
Reuters reported on November 12 that the incoming Congress could use hearings, document requests, funding negotiations and war-powers legislation to challenge the administration’s approach. Congress cannot simply direct the president to end a war through oversight alone, and any legislation could face a presidential veto. Nevertheless, control of defence appropriations and the annual defence authorisation process gives lawmakers meaningful leverage over military policy.
The political stakes are heightened by the war’s role in the midterm campaign. The Washington Post reported that the conflict and its consequences became a significant source of concern for Republicans after their election losses. The newspaper also described uncertainty inside the Pentagon about how the new congressional majority would approach senior military officials and the department’s leadership.
Military Strikes And Pentagon Leadership Under The Microscope
Investigations may extend beyond Iran. Democratic lawmakers have indicated interest in the Pentagon’s operations against suspected drug-trafficking vessels in the Caribbean and eastern Pacific, including questions about the legal justification for lethal force and the handling of people who survive strikes. Such inquiries could require senior commanders and civilian officials to explain how targeting decisions were made and what legal advice was considered.
Hegseth’s handling of sensitive information is another potential subject. The controversy surrounding his use of the Signal messaging application to discuss details of an imminent military operation in Yemen previously drew scrutiny over whether classified or operationally sensitive information had been properly protected. A new Congress could seek further records and testimony about the incident, the department’s internal review and any changes made to information-security procedures.
House Armed Services Committee Democrat Adam Smith has identified military operations, what he describes as the politicisation of the armed forces, and possible corruption in defence contracting as areas for investigation. The Washington Post reported that Smith expects to lead the committee when Democrats take control, positioning him to shape hearings and requests for Pentagon records.
Personnel decisions could also attract attention. Hegseth has overseen the departure or removal of numerous senior military leaders. The incoming majority may seek to establish the reasons for those decisions, whether established procedures were followed and whether political considerations influenced appointments and dismissals. The administration has defended its approach as part of its effort to reshape the military, while critics argue that the changes risk weakening institutional independence and professional standards.
Defence Spending Could Become Another Battleground
Congressional oversight is not limited to hearings and investigations. The incoming majority will have substantial influence over defence spending, procurement priorities and the annual National Defense Authorization Act. That could put several high-profile Pentagon programmes under pressure, particularly where lawmakers question costs, procurement processes or the administration’s priorities.
Axios reported that Democratic gains have complicated the administration’s plans for major defence initiatives and its proposed spending package. Defence One also reported that programmes associated with the administration’s wider military transformation agenda could face funding uncertainty, while questions about contract awards and access for politically connected businesses may attract congressional attention.
These debates could have practical consequences for the armed forces. Delayed appropriations or prolonged disputes over the defence budget can affect procurement schedules, weapons replenishment, military readiness and long-term planning. Lawmakers will therefore face pressure to distinguish political oversight from decisions that could disrupt essential military operations.
Hegseth And The White House Reject The Prospect Of Retreat
Hegseth’s allies have rejected suggestions that congressional investigations should force him from office. Pentagon spokesman Sean Parnell told the Washington Post that Hegseth remained committed to leading the department and that the Pentagon had followed the law. The department has characterised threats of investigations as politically motivated, while Democrats argue that oversight is a core responsibility of Congress.
President Donald Trump has also publicly defended Hegseth and said he intends to keep him in the administration. That support is an important factor in the secretary’s political position. However, a change in congressional control could make it more difficult for the White House to shield the Pentagon from hearings, subpoenas, funding restrictions and demands for public explanations.
What The New Congress Can — And Cannot — Do
Once the new lawmakers are sworn in, committee chairs can schedule hearings, request documents, issue subpoenas under committee rules and question current or former officials. Congress can also use its legislative and budgetary powers to place conditions on funding, require reports and seek changes to defence policy. These tools can generate significant pressure even if they do not immediately lead to an official’s removal.
There are limits. Investigations do not establish wrongdoing by themselves, and allegations must be tested against evidence and the responses of those involved. Impeachment would require a House majority, while removal would require a two-thirds Senate conviction. The administration could also challenge subpoenas, assert executive privilege or dispute Congress’s authority, potentially sending some conflicts to court.
The coming months will therefore test both Hegseth’s ability to defend the Pentagon’s record and the incoming Congress’s ability to conduct credible oversight without allowing national security decisions to become purely partisan contests. The most consequential developments may emerge not from a single impeachment vote, but from a series of hearings, document releases, budget negotiations and public testimony.
For now, Hegseth remains in office, backed by Trump, and the current Congress has blocked the latest impeachment push. But the political environment is changing. When the 120th Congress convenes in January, the defense secretary will face lawmakers with new committee leadership and a stated intention to examine the administration’s military decisions more closely. Whether that scrutiny produces policy changes, formal findings or another attempt at impeachment will depend on what the evidence shows and how far congressional leaders are prepared to take the investigations.