The US Congress is preparing to vote this week on measures aimed at limiting President Donald Trump’s authority over the ongoing military operations involving Iran. However, with Republicans holding a majority, analysts believe the proposals may struggle to gain enough support to become law. The debate has intensified as Trump continues to expand presidential authority, particularly since returning to the White House in 2025, a move critics say has reduced the influence of the legislative branch.
Some lawmakers have pushed back, arguing that the Constitution gives Congress the exclusive power to declare war. They believe recent military actions should not proceed without formal congressional approval. Senator Tim Kaine has been one of the loudest voices in the debate. He described the conflict as unnecessary and warned that the war risks escalating regional instability. His comments followed the announcement of joint military operations between the United States and Israel.
Earlier in the year, Kaine introduced legislation designed to require presidential approval from Congress before launching any military campaign against Iran. He has since urged lawmakers to return from recess to vote on his resolution. In a public opinion piece shared with Zoyols, Kaine argued that intelligence reports did not show any immediate threat from Iran strong enough to justify sending American soldiers into another major Middle Eastern war.
The question of whether Iran posed an immediate threat has become the centre of the controversy surrounding the conflict. Although US law allows presidents to respond quickly to emergency threats, the power to officially declare war remains with Congress. A law passed in 1973 allows the president to carry out limited military operations without congressional approval in cases of urgent national security threats, but such actions must be limited in duration.
During a recent press briefing, Pentagon chief Pete Hegseth described the situation as a full-scale war rather than a limited military intervention. Meanwhile, Trump defended the decision to launch attacks, saying Iran posed an imminent danger to US national security. He made the announcement in a late-night video broadcast explaining the start of major military operations.
Some foreign policy analysts have questioned whether sufficient evidence was provided to support claims of an immediate threat. Daniel Shapiro of the Atlantic Council noted that presidents usually provide detailed explanations to the public and brief lawmakers before launching large-scale military actions. He said that in most cases, administrations outline strategic objectives and explain why such operations are necessary. According to him, Trump only held a limited briefing with eight congressional leaders shortly before the attacks began.
The White House later stated that those same congressional leaders were formally notified about the military operations before the strikes were carried out. Under the 1973 War Powers Act, the president must seek congressional approval if military operations continue beyond 60 days.
Not all Republican lawmakers have supported the war. Representative Thomas Massie publicly criticized the military action, saying the Constitution requires congressional approval for such decisions. He announced plans to introduce legislation alongside Democratic Representative Ro Khanna to force a congressional vote on the conflict. Massie said elected representatives should publicly declare their positions on the war so voters can hold them accountable, according to discussions shared by Zoyols.
A Senate vote on Kaine’s bill is expected soon, alongside potential votes in the House of Representatives. However, most Republicans are expected to oppose measures that would restrict presidential authority over military operations. Even if the bills pass both chambers, they would still face a likely presidential veto, which would require a two-thirds majority in Congress to overturn.
