WASHINGTON: Senators are set to meet with top national security officials Thursday as many question President Donald Trump’s decision to bomb three Iranian nuclear sites — and whether those strikes were ultimately successful.

The classified briefing, which was originally scheduled for Tuesday and was delayed, also comes as the Senate is expected to vote this week on a resolution that would require congressional approval if Trump decides to strike Iran again. Democrats, and some Republicans, have said that the White House overstepped its authority when it failed to seek the advice of Congress and they want to know more about the intelligence that Trump relied on when he authorized the attacks.

“Senators deserve full transparency, and the administration has a legal obligation to inform Congress precisely about what is happening,” said Senate Democratic Leader Chuck Schumer, who said Tuesday that it was “outrageous” that the Senate and House briefings were postponed. A similar briefing for House members was pushed to Friday.

CIA Director John Ratcliffe, Secretary of State Marco Rubio and Defense Secretary Pete Hegseth are expected to brief the senators on Thursday. Director of National Intelligence Tulsi Gabbard was scheduled to be at the Tuesday briefing, but will not be attending, according to a person familiar with the schedule.

The briefing could be contentious as questions have swirled around Trump’s decision to strike Iran and whether the attacks were successful. A preliminary US intelligence report found this week that Iran’s nuclear program had been set back only a few months, contradicting statements from Trump and Israeli Prime Minister Benjamin Netanyahu about the status of Iran’s nuclear facilities, according to two people familiar with the report. The people were not authorized to address the matter publicly and spoke on condition of anonymity.

On Wednesday, Gabbard and Ratcliffe sent out statements backing Trump’s claims that the facilities were “completely and fully obliterated.” Gabbard posted on social media that “new intelligence confirms what @POTUS has stated numerous times: Iran’s nuclear facilities have been destroyed.”

She said that if the Iranians choose to rebuild the three facilities, it would “likely take years to do.”

Ratcliffe said in a statement from the CIA that Iran’s nuclear program has been “severely damaged” and cited new intelligence “from a historically reliable and accurate source/method that several key Iranian nuclear facilities were destroyed and would have to be rebuilt over the course of years.”

Most Republicans have staunchly defended Trump and hailed the tentative ceasefire he brokered in the Israel-Iran war. House Speaker Mike Johnson even went as far as to question the constitutionality of the War Powers Act, which is intended to give Congress a say in military action.

“The bottom line is the commander in chief is the president, the military reports to the president, and the person empowered to act on the nation’s behalf is the president,” Johnson told reporters.

But some Republicans – including some of Trump’s staunchest supporters – are uncomfortable with the strikes and the potential for US involvement in an extended Middle East conflict.

“I think the speaker needs to review the Constitution,” said Sen. Rand Paul, R-Kentucky “And I think there’s a lot of evidence that our Founding Fathers did not want presidents to unilaterally go to war.”

Paul would not say if he is voting for the resolution by Sen. Tim Kaine, D-Virginia, that would require congressional approval for specific military action in Iran. The resolution is likely to fail as 60 votes would be needed to pass it and Republicans have a 53-47 majority. But Kaine says it’s important to put the Senate on the record.

“You have a debate like this so that the entire American public, whose sons and daughters are in the military and whose lives will be at risk in war, get to see the debate and reach their own conclusion together with the elected officials about whether the mission is worth it or not,” Kaine said.

While he did not seek approval, Trump sent congressional leaders a short letter Monday serving as his official notice of the strikes, two days after the bombs fell.

The letter said that the strike was taken “to advance vital United States national interests, and in collective self-defense of our ally, Israel, by eliminating Iran’s nuclear program.”