Mojtaba Khamenei chosen as Iran's next supreme leader, Iranian state media reports

Continued missile and drone strikes were reported across the Middle East in the early hours of Monday morning.

The Qatari Ministry of Defense said that armed forces intercepted a missile attack.

Emergency management in the UAE released a statement saying air defenses were dealing with a missile threat.

The Ministry of Defense in Saudi Arabia said it intercepted and destroyed two drones heading toward the Shaybah field.

The Bahrain Interior Ministry said in a statement that warning sirens were sounding, writing, "citizens and residents are urged to remain calm and head to the nearest safe place."

The Kuwait Army said air defenses were confronting hostile missile and drone attacks.

In a wide-ranging interview with "60 Minutes," Defense Secretary Pete Hegseth said the U.S. mission in Iran was “on track” and that surrender would be achieved by degrading Iran’s military power.

He said the U.S. was not fighting a regime-change war, and that the military mission did not involve ushering a new government into power.

Hegseth said the U.S. would extinguish the nuclear threat posed by Iran, and that the Pentagon has options "to get after" highly enriched uranium that remains in the country.

Speaking of the campaign, Hegseth said, "This is only just the beginning."

-ABC News' Chris Boccia

A seventh U.S. service member has died from injuries received during the initial attacks by the Iranian regime across the Middle East, the U.S. Central Command (CENTCOM) announced Sunday.

The service member, whose name was not immediately released, was seriously wounded on March 1 in an Iranian attack on U.S. troops in Saudi Arabia, according to CENTCOM.

Seven service members have now been killed in action during Operation Epic Fury, which was launched on Feb. 28, according to CENTCOM.

The Department of War later announced Sunday that another service member died from a medical emergency as a result of a non-combat related incident. They were identified as Maj. Sorffly Davius, 46, of Cambria Heights, Queens, New York.

Davius died on March 6 at Camp Buehring in Kuwait.

Six service members died Feb. 28 during an attack at Shuaiba port in Kuwait, a commercial harbor that doubles as a logistics hub for the U.S. military.

In addition to the dead, a U.S. official told ABC News that nine U.S. service members have been seriously wounded from attacks across the region.

President Donald Trump took to social media on Sunday, posting about the war in Iran's impact on oil prices.

Trump said that "short term oil prices" are a "very small price to pay" for safety and peace across the world.

"Short term oil prices, which will drop rapidly when the destruction of the Iran nuclear threat is over, is a very small price to pay for U.S.A., and World, Safety and Peace. ONLY FOOLS WOULD THINK DIFFERENTLY!" he wrote.

Oil prices have risen above $100 a barrel as the war continues. This means even higher gas prices are coming to the pump. Oil is trading at about $101 a barrel, up 11%.

-ABC News' Isabella Murray