The US House of Representatives passed House Joint Resolution 37 on Feb. 13, calling for the withdrawal of US armed forces from hostilities in the Republic of Yemen. The resolution states that only Congress has the authority to declare war, and notes that Congress has not made any declaration of war against the Houthi rebels in Yemen, who are the target of Saudi-led forces. US armed forces have supported Saudi Arabia through aerial targeting assistance, intelligence sharing, and mid-flight aerial refueling. The resolution gives President Donald Trump 30 days to withdraw forces from hostilities in or affecting Yemen. Forces which are involved in operations directed at al-Qaeda in the region are exempt from the resolution. The resolution also does not restrict the sharing of intelligence. It also specifies that the resolution does not impact military operations undertaken in cooperation with Israel.

Yemen war crime investigators on Sept. 25 called upon the UN Human Rights Council to renew their mandate and allow the continued inquiry into Yemen's internal conflict, calling the situation in the county "extremely alarming." The Group of Eminent Experts on Yemen, in their initial report (PDF), released in August, found evidence that "members of the Saudi-led coalition, the Yemeni government, and the Houthi armed group have been committing abuses, including indiscriminate and disproportionate attacks on civilians, arbitrary and abusive detention, and recruitment of children." At the time of the report, the experts recommended that their mandate be renewed. However, Saudi Arabia and other coalition members have pressed the council to discontinue the inquiry.

A UN human rights panel report released Aug. 28 suggests that parties to the armed conflict in Yemen have been perpetuating crimes under international law. The Group of International and Regional Eminent Experts on Yemen was appointed (PDF)  by the UN Human Rights Council to monitor and report on the human rights situation in the country, as well as to examine all alleged violations and crimes of international law to occur since the war began in September 2014. The report concluded that air-strikes carried out by the government of Yemen and its coalition, including Saudi Arabia and the United Arab Emirates, have caused a majority of the civilian casualties. Other violations included persistent sexual violence and enlistment of young children into the armed forces of both sides in the war.

Following peace talks hosted by Eritrea, the government of Ethiopia announced a peace deal with the Oromo Liberation Front rebels Aug. 7. The deal guarantees rebel leaders the right to participate in Ethiopia's political process in exchange for laying down arms. The OLF has long been backed by Eritrea, and the pact comes one month after a formal end was declared to the two-decade state of war between Ethiopia and Eritrea, with Ethiopia ceding its claim to the contested border town of Badme. This points to a softening of positions under Ethiopia's new prime minister, Abiy Ahmed. The Badme deal was also said to have been quietly brokered by the United Arab Emirates, which has emerged as politically isolated Eritrea's most significant foreign patron, part of an apparent design to encircle Yemen.

US President Donald Trump issued an executive order Aug. 6 reimposing certain sanctions against Iran. In a press statement, the White House criticized the Iran nuclear deal, the Joint Comprehensive Plan of Action (JCPOA) of July 2015, signed by Iran, Germany, the five permanent members of the UN Security Council and the EU. The US withdrew from the JCPOA in May, prompting a legal challenge from Iran before the International Court of Justice. The White House stated that JCPOA "threw a lifeline of cash to a murderous dictatorship that has continued to spread bloodshed, violence, and chaos." The administration claims Iran used monies freed by the JCPOA to fund nuclear-capable missiles, terrorism, and to support the conflicts in Syria and Yemen.

A year after a network of secret prisons was first exposed in southern Yemen, Amnesty International has issued a new report documenting continued rights violations in these facilities, including systemic forced disappearance, torture and other ill-treatment that may amount to "war crimes." The report, God only knows if he's alive, details how scores of men have been arbitrarily arrested and detained by United Arab Emirates (UAE) and Yemeni forces operating outside the command of their own government. Many have been tortured, with some feared to have died in custody. Since joining the conflict in March 2015, the UAE has created, trained, equipped and financed various local security forces known as the Security Belt and Elite Forces, bypassing their leadership in the Yemeni government. 

The US Supreme Court on June 26 ruled 5-to-4 (PDF) in Trump v. Hawaii that President Donald Trump's proclamation restricting entry from particular Muslim-majority countries was "squarely within the scope of presidential authority" under the Immigration and Nationality Act. The court also found that plaintiffs challenging the proclamation were unlikely to succeed on their claim that the ban violates the Establishment Clause of the First Amendment. Chief Justice John Roberts wrote for the majority: "[T]he Government has set forth a sufficient national security justification to survive rational basis review. We express no view on the soundness of the policy. We simply hold today that plaintiffs have not demonstrated a likelihood of success on the merits of their constitutional claim." The ruling overturns a preliminary injunction issued by the Ninth Circuit Court of Appeals in December, which blocked the policy from taking effect. The Supreme Court remanded the case back to the lower courts for "further proceedings."

With the Saudi-led military coalition in Yemen launching a major offensive on the rebel-held port of Hodeidah, aid groups are warning of a humanitarian disaster on a scale far outstripping that already seen. Yemen is already considered the world's worst humanitarian crisis, with 10.4 million people at risk of famine. Hodeidah is the entry point for 70% of the aid upon which over 22 million Yemenis depend. "The attack on Hodeidah places millions more people at risk of starvation and could violate UN Security Council (UNSC) Resolutions 2140 and 2216, regarding obstruction of the delivery of humanitarian assistance.,"  said a statement from the Global Centre for the Responsibility to Protect. The UN Office for the Coordination of Humanitarian Affairs (OCHA) warned that a sustained battle or siege of Hodeidah could lead to the deaths of as many as 250,000 civilians.