Live updates: Trump says US will bomb Iran's power plants if Strait of Hormuz isn't reopened

President Donald Trump took the United States to war without a vote of support from Congress, but lawmakers are increasingly questioning when, how and at what cost the war with Iran will come to an end.

As the conflict enters its fourth week, the toll is becoming apparent. At least 13 U.S. military personnel have died, and more than 230 have been wounded. A $200 billion request from the Pentagon for war funds is pending at the White House. Allies are under attack, oil prices are spiking and thousands of U.S. troops are deploying to the Middle East with no endgame in sight.

Trump said late Friday that he was considering "winding down" the military operations even as he outlined new objectives and goals. Meanwhile, Israel said Saturday that the war was only at its half-way point and vowed to ramp up attacks. 

Here are the latest Iran war updates from Sunday:

Iran rejects threats over Strait of Hormuz 

4:15 p.m. ET: Iran's foreign minister said Sunday that critical oil traffic isn’t passing through the Strait of Hormuz because insurance companies are concerned about the war, not because of Iran’s actions.

He also said that further threats from Trump against Iran will not sway Iranians nor insurers. Trump says the U.S. will bomb Iran's power plans if the Strait of Hormuz isn't reopened within 48 hours. 

Iran urges UN Security Council to stop war

1:30 p.m. ET: A letter from Iran's foreign minister asks the United Nations Security Council to "compel the aggressors to immediately cease all unlawful attacks" and make them pay reparations for damage to Iran’s nuclear and other sites. Iran’s main enrichment site, Natanz, was struck again Saturday.

The U.N.’s most powerful body has condemned Iran’s retaliatory strikes on Gulf neighbors, but not the attacks from Israel and the U.S. that launched the war.

The letter also urges the council to make Israel place its own nuclear facilities under "verification and monitoring" of the U.N. nuclear watchdog. Israel is widely believed to possess nuclear weapons, though it doesn’t confirm or deny their existence.

Trump says US will bomb Iran's power plants if Strait of Hormuz isn't reopened

8:09 a.m. ET: Trump has warned that the U.S. will "obliterate" Iran’s power plants if it doesn’t fully open the Strait of Hormuz within 48 hours.

The Strait of Hormuz, where about 20% of the world's oil passes through daily, has effectively been closed since the U.S. and Israel attacked Iran. Trump is facing increasing pressure at home to secure the strait as oil prices soar.

Trump said on Saturday that he would give Iran 48 hours to open the vital Strait of Hormuz or face a new round of attacks. He said the U.S. would destroy "various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!"

He may have meant the Bushehr nuclear power plant, Iran's biggest, which was already hit last week, or Damavand, a natural gas plant near Tehran, Iran's capital.

READ MORE: Gas prices skyrocket in US, up nearly $1 a gallon in past month

In turn, Iran warned early Sunday that any strike on its energy facilities would prompt attacks on U.S. and Israeli energy and infrastructure assets — specifically information technology and desalination facilities — in the region, according to a statement citing an Iranian military spokesperson carried by state media and semiofficial outlets.

Qatar says 6 dead in helicopter crash

8:05 a.m. ET: One person is still missing from the crash on Saturday in Qatar's territorial waters, the Qatari Interior Ministry said.

Officials didn’t clarify the nationality of the dead or say if they were civilian or military.

The Defense Ministry blamed a "technical malfunction" for the crash.