President Donald Trump speaks during a meeting with Canadian Prime Minister Justin Trudeau in the Oval Office of the White House, June 20, 2019, in Washington.
President Donald Trump speaks during a meeting with Canadian Prime Minister Justin Trudeau in the Oval Office of the White House, June 20, 2019, in Washington.

Carla Babb, Steve Herman, Katherine Gypson, Ken Bredemeier contributed to this report.

WASHINGTON  — The United States and Iran edged closer to armed conflict Thursday following the downing of a U.S. Global Hawk surveillance drone over the Strait of Hormuz, a development U.S. President Donald Trump called a “very bad mistake.”

“This is a new fly in the ointment,” Trump said Thursday while meeting with Canadian Prime Minister Justin Trudeau at the White House.

“This drone was in international waters, clearly. We have it all documented. It’s documented scientifically, not just words,” Trump said, telling reporters, “You’ll find out,” when asked about a potential U.S. response.

For its part, Iran argued the drone flight path was not only unlawful, but a “blatant violation of International law.”

The U.S. drone “conducted an overflight through the Strait of Hormuz to Chabahar port in full stealth mode as it had turned off its identification equipment and engaged in a clear spying operation,” Iranian Ambassador to the United Nations Majid Ravanchi wrote in a letter to the U.N.

“While the Islamic Republic of Iran does not seek war, it reserves its inherent right … to take all appropriate necessary measures,” he wrote.

Foreign Minister Mohammad Javad Zarif also defended Tehran’s actions, sharing Iran’s version of the coordinates of the drone’s flight on Twitter.

“We’ve retrieved sections of the US military drone in OUR territorial waters where it was shot down,” he said.

US military responds

U.S. Air Forces Central Command, which oversees U.S. military activity in the region, called the Iranian claims “categorically false.”

“This attack is an attempt to disrupt our ability to monitor the area following recent threats to international shipping and free flow of commerce,” Lt. Gen Joseph Guastella said in a statement he read to reporters at the Pentagon, adding the drone was 34 kilometers from the Iranian coastline when it was shot down.

Guastella also said the Iranian attack risked harming civilians using established air corridors between the United Arab Emirates and Oman.

U.S. officials said several naval ships have been dispatched to recover pieces of the drone from a debris field in international waters.

Path of U.S. Global Hawk surveillance drone over the Strait of Hormuz.

The RQ-4 drone costs more than $222 million and can surveil about 100,000 square kilometers a day, an area about the size of South Korea or Iceland.

Growing risk of miscalculation

Concern about a potential armed confrontation between the U.S. and Iran has been growing since U.S. officials last week accused Iran of being responsible for mine attacks on two oil tankers in the Strait of Hormuz, allegations Tehran denies.

Earlier this week, top defense officials warned of a growing risk of miscalculation. And U.S. lawmakers briefed by top intelligence and defense officials at the White House late Thursday also expressed concern.

“I told the president that these conflicts have a way of escalating,” Senate Minority Leader Chuck Schumer told reporters. “We’re worried that he and the administration may bumble into war.”

The U.S. announced this week it was authorizing another 1,000 troops, including a Patriot missile battery and additional manned and unmanned reconnaissance aircraft, to bolster defenses at U.S. positions in Iraq and Syria, citing numerous “threat streams” that “link back to the Iranian regime.”

Earlier Thursday, South Carolina Republican Senator Lindsey Graham warned if Iran kept pushing for a fight with the U.S., it may very well get its wish.

“He believes that we’re getting into a bad space, that his options are running out,” Graham told reporters after speaking with President Trump.

But while talking with reporters at the White House, Trump seemed to allow room for some diplomatic maneuvering.

“It could have been somebody that was loose and stupid,” he said of whoever ordered the attack.

He also said, “It would have made a big, big difference” had Iran shot down a manned U.S. aircraft.

US Air Force RQ-4 Global Hawk unmanned aircraft.

International concern growing

International concern about the prospects of armed conflict between the U.S. and Iran is also growing.

“Obviously the facts need to be established,” Stephane Dujarric, spokesman for U.N. Secretary-General Antonio Guterres, told reporters in New York.

“He has warned against any escalation. Warned, stressed that the world cannot afford a major conflict in that area,” Dujarric said. “I think it’s important that all parties exercise maximum restraint and avoid any action that could inflame the situation.”

Russian President Vladimir Putin also warned the U.S. against retaliating for the incident, saying U.S. use of force against Iran “would be a disaster for the region.”

The U.S. military said Iran first tried to shoot down a U.S. drone last week.

Iran nuclear deal

Relations have deteriorated since Trump withdrew last year from the international agreement that limited Iran’s nuclear program in exchange for sanctions relief.

Since then, the U.S. has levied a variety of sanctions against Iran as part of a “maximum pressure” campaign against Iran, aimed at bringing Tehran back to negotiations in order to secure what White House officials have described as a more comprehensive nuclear deal that also addresses Iran’s missile program and its support for terrorist groups.

U.S. officials believe the Iranian government is feeling the pressure from the renewed sanctions. But in response, Iran announced increased production of low-enriched uranium as it seeks help from European nations to circumvent the U.S. measures.