WATCH: White House says U.S. ground troops in Iran are 'not part of the plan' for now

The White House said Wednesday that U.S. ground troops in Iran are "not part of the plan" for the Iran operation "at this time."

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White House press secretary Karoline Leavitt said she would not take away military options on behalf of the president by ruling it out, saying that leaders in the past take options off the table "without having a full understanding of how things could develop."

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"It's not part of the current plan, but I'm not going to remove an option for the president that is on the table," Leavitt said.

Trump to attend transfer of soldiers' remains

Trump plans to attend the dignified transfer at Dover Air Force Base of U.S. troops killed in the Middle East conflict, the White House said Wednesday, one of the most solemn duties undertaken by the commander in chief.

The Pentagon is working to schedule the transfer. The U.S. has said six soldiers were killed.

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"These heroes represent the very best among us," White House press secretary Karoline Leavitt said Wednesday.

White House claims that Spain has agreed to cooperate with US operations in Mideast

The White House on Wednesday said Spain has agreed to cooperate with U.S. operations in the Mideast after Trump had threatened to cut off trade with Madrid.

"With respect to Spain, I think they heard the president's message yesterday loud and clear," White House press secretary Karoline Leavitt said. "And it's my understanding over the past several hours, they've agreed to cooperate with the US military. And so I know that the US military is coordinating with their counterparts in Spain."

Trump on Tuesday said he was going to "cut off all trade with Spain," the day after Foreign Minister José Manuel Albares said his country would not allow the U.S. to use jointly operated bases in southern Spain in any strikes not covered by the United Nations' charter.

White House says Trump thinks the U.S. public supports war with Iran

Asked if Trump thinks that Americans support the Israel-U.S. war in Iran — even though Trump hasn't given a national address to personally make the case — Leavitt said, "I think he does."

"This was a rogue terrorist regime that has been threatening the United States, our allies and our people for 47 years," she said. "And the American people are smart enough to know that, and they're smart enough to listen to the president himself — not just over the past year, in the second term, but during his first term as president."

READ MORE: Trump has spent years deriding foreign entanglements. Now, he's taken the U.S. to war with Iran

Recent polling shows that, prior to the U.S.-Israel strikes that started last weekend, 61% of Americans said Iran was an "enemy" of the U.S., but only about 3 in 10 Americans said they had "a great deal" or "quite a bit" of trust in Trump.

White House says Trump spoke to Kurdish leaders about U.S. bases in Iraq

Leavitt was asked about reports that Trump had a conversation with Kurdish leaders in Iraq and has sought military support for Iranian Kurdish groups.

"He did speak to Kurdish leaders with respect to our base that we have in northern Iraq. But as for any report suggesting that the president has agreed to any such plan is completely false and should not be written," Leavitt said.

White House again says Iran war aimed to head off an attack

The White House press secretary said Wednesday the U.S. launched its operation partly out of concern Iran might strike American personnel and assets in the region first.

Leavitt said a phone call between Trump and Israeli Prime Minister Benjamin Netanyahu before they launched the war was "important with respect to the timeline."

However, she said, "I think the president, prior to that phone call, had a good feeling that the Iranian regime was going to strike the United States assets and our personnel in the region."

U.S. is investigating reports that a girls school in Iran was hit in strikes

Asked if U.S. strikes hit a girls school in Iran — as officials in the region have suggested — Leavitt said, "Not that we know of."

She said U.S. defense officials are "investigating this matter" and added that she wanted to say "very strongly, the United States of America does not target civilians, unlike the rouge Iranian regime."

WATCH: Trump pushes back at conservative voices critical of Iran war

Iran's top diplomat posted on social media on Monday an aerial photo showing rows of graves that he said were for more than 160 girls killed during a U.S.-Israeli strike on an elementary school in Minab.

U.S. Central Command spokesperson Capt. Tim Hawkins said then that he was "aware of reports" that a school was struck and that officials were looking into them.

White House defends evacuation plans for Americans

The president's top spokeswoman pushed back against criticisms that the administration didn't do enough to ensure Americans could leave the Middle East following the U.S. war in Iran.

Leavitt insisted that "there have been plans in place" and that the State Department has been clear to those in the region to leave immediately.

"We will help every single American who wants to come home if they're making that request of the State Department," she said.

Leavitt also said a State Department hotline that told callers not to rely on help from the U.S. government to leave the region has been corrected.