In the United States, the decision faced sharp criticism from members of the House of Representatives, with several members accusing the president of pushing the country toward a new war without congressional authorization.
Congressional Democratic Leader Hakeem Jeffries said Trump "misled the country about his intentions and did not obtain congressional authorization to use military force, threatening to embroil America in a potentially catastrophic war in the Middle East."
For her part, Democratic Senator Jeanne Shaheen expressed concern about the president's actions, asserting that he "failed to seek congressional authorization, despite his previous promise to bring peace to the Middle East."
House Speaker Nancy Pelosi described the move as a "disregard for the Constitution by engaging the U.S. military without congressional authorization," and demanded immediate answers regarding the operation, which she described as "endangering and destabilizing Americans."
Republican Representative Thomas Massie also expressed his opposition to the operation, writing on Twitter that "Trump's bombing of Iranian nuclear sites is unconstitutional."
In the same context, independent Senator Bernie Sanders considered the decision "blatantly unconstitutional," noting that "the only entity with the authority to declare war is Congress, not the president."
Mixed international reactions
Externally, world leaders were divided in their reactions to the US strikes that targeted three Iranian nuclear sites on Sunday.
In this context, Israeli Prime Minister Benjamin Netanyahu praised the strikes, calling them "a bold decision by Trump," saying, "History will record that Trump acted to prevent the most dangerous regime in the world from possessing the most dangerous weapons."
In contrast, Tehran strongly condemned the attack. Iranian Foreign Minister Abbas Araqchi said, "The United States has committed a grave violation of the UN Charter and international law," adding that Iran "reserves all options to defend its sovereignty and its people."
Riyadh expressed its "condemnation and denunciation of the violation of Iran's sovereignty," noting the "need to exert every effort to exercise restraint, de-escalate, and avoid escalation."
The Sultanate of Oman also stated that the US strikes against Iran's nuclear facilities constitute a serious violation of international law and the UN Charter.
In turn, Iraq commented on the US strike on Iran, stating that the major powers' responsibility lies in defusing the crisis, not inflaming it or becoming involved in it.
UN Secretary-General António Guterres expressed "grave concern" over the escalation, calling on all parties to de-escalate and return to diplomacy, warning that "the situation could quickly spiral out of control, jeopardizing international peace and security."
In the same context, several countries expressed their concern about the escalation. New Zealand, through its Foreign Minister Winston Peters, affirmed that "the ongoing military actions are deeply worrying," calling for a return to dialogue.
Australia, for its part, expressed a cautious stance, noting the "volatility of the security situation in the region" and affirming its support for diplomatic efforts.
For its part, the Mexican Ministry of Foreign Affairs called for "de-escalation of tensions and the restoration of peaceful coexistence," while Venezuela, through its Foreign Minister Ivan Gil, condemned "the US military aggression," considering it to have come "at the request of the State of Israel."
Cuban President Miguel Díaz-Canel also described the attack as "a dangerous escalation that violates the UN Charter and plunges humanity into a crisis with irreversible consequences."
Earlier on Sunday, Trump said in a post on Truth Social that "US aircraft dropped a full load of bombs on Fordow, Natanz, and Isfahan before safely leaving Iranian airspace."
Since June 13, Israel has been waging an aggression against Iran, targeting nuclear facilities, missile bases, military leaders, and nuclear scientists.
Tehran responded by launching ballistic missiles and drones deep into Israel, in the largest direct confrontation between the two sides.
