Trump says damage to Iran's nuclear sites is 'far below ground level'

Senate Republicans largely lined up behind President Donald Trump's handling of the conflict between Iran and Israel and said they trusted Trump's judgment on whether the United States ought to involve itself.

Most Republicans said that they agreed with Trump that Iran cannot have a nuclear weapon.

"Either you want them to have a nuclear weapon, or you don't," Sen. Lindsay Graham, R-S.C., said. "And if you don't, if diplomacy fails, you use force."

"I think this is something on which the entire world can agree: Iran cannot have a nuclear weapon, or the ability to deliver a nuclear warhead, period," Sen. John Kennedy, R-La., said.

"If Israel has a plan which is appropriate to take care of the problem, then we don't need to be there, but we should never take or eliminate options that are available to the president in exercising his authority as the commander-in-chief," Sen. Mike Rounds, R-S.D., said.

Both Republicans and Democrats said they would like Congress to have a role in determining whether the U.S. gets involved in the conflict, but Republicans were much less forceful.

-ABC News' Allison Pecorin

Director of National Intelligence Tulsi Gabbard's closed-door Senate Intelligence Committee hearing, which was set for Wednesday afternoon, was rescheduled due to the "ongoing developments in the Middle East," a committee spokesperson confirmed to ABC News.

"The briefing wasn’t canceled, it was rescheduled. Given ongoing developments in the Middle East, we are looking to find a mutually agreeable day in the near future," the spokesperson said.

-ABC News' Beatrice Peterson

President Trump, in an Oval Office event on Wednesday, said he'd be having a Situation Room meeting soon on Iran and Israel.

"We're having a meeting downstairs in an hour," Trump said.

The president was asked if he's made a decision yet on what to do.

"I have ideas as to what to do but I haven't made a final -- I like to make the final decision one second before it's due, because things change, especially with war," he said.

During a briefing Wednesday evening, Israel Defense Forces Chief Effie Defrin gave an update on the last 24 hours of the ongoing military operation against Iran.

"In the past 24 hours, we have launched three major waves of strikes," Defrin said, noting that most of the aerial attacks have been focused on Iran's capital city, Tehran.

The IDF chief said the third wave, which is ongoing, will be targeted at western Iran.

Defrin said Israel Air Force aircraft are flying over "launch and storage sites for surface-to-surface missiles."

"The jets are targeting operatives attempting to re-access and remove munitions from sites that were previously struck," Defrin said.

-ABC News' Will Gretsky