71 killed in Israeli attack on Iran prison, official says

Iran still retains "considerable" tactical capabilities and remains a threat to U.S. troops in the region, a senior military commander told lawmakers on Tuesday.

Iran’s power has been weakened in general since Israel’s military campaign began, Vice Adm. Brad Cooper told the Senate Armed Services Committee.

But when asked if Iran still poses a severe threat to U.S. troops and Americans around the world, Cooper said yes.

"They do. They possess considerable tactical capability, one element of which we saw yesterday, which we thwarted in defense of al-Udeid air base," Cooper said.

Cotton noted there could be other threats too, including terrorist attacks backed by Iranian-backed groups.

"Completely agree, sir, we've got to be in a three point stance, ready to go every single day," Cooper said.

Cooper declined to provide more specifics, including any assessment of Iran’s nuclear program after the U.S. strike on the country’s nuclear facilities. Cooper said more details would be offered to lawmakers in a classified session later that day.

-ABC News' Anne Flaherty

Iran won’t violate the ceasefire unless Israel does, Iranian President Masoud Pezeshkian said Tuesday, according to Iran’s state-run media.

Pezeshkian made the comments in a telephone conversation with the prime minister of Malaysia Tuesday, Tasnim, Iran’s semi-official news agency, reported.

When Israel "failed to achieve its objectives, the U.S. directly participated in anti-Iran crimes and, contrary to all international rules, attacked Iranian nuclear sites," Pezeshkian said, according to Tasnim.

The Iranian attack on Al Udeid Air Base, the U.S. military site in Qatar, was "one of the most distressing consequences," of Israel’s "military aggression" against Iran, Pezeshkian told UAE President Mohammed bin Zayed Al Nahyan on Tuesday, IRNA, Iranian state-run media, reported.

Iran was compelled to respond to the "U.S. crimes" by attacking an American airbase in Qatar, Pezeshkian said. This does not mean Iran is in conflict with the Qatari government and people, he said, according to Tasnim.

Drones unsuccessfully targeted some U.S. military bases in Iraq Monday night and there were no American casualties, a U.S. official confirmed to ABC News.

-ABC News' Luis Martinez

The House and Senate will both receive separate classified briefings on the Iran-Israel conflict Tuesday afternoon.

The briefings are expected to include National Intelligence Director Tulsi Gabbard, CIA Director John Ratcliffe, Joint Chiefs of Staff Chairman John Caine, Deputy Secretary of State Christopher Landau and Deputy Defense Secretary Steve Feinberg, sources told ABC News.

Lawmakers, especially Democrats, will be looking for answers and evidence at the briefings from the administration, specifically why President Donald Trump said there was an imminent threat and carried out U.S. strikes on Iran’s nuclear sites.

Speaker of the House Mike Johnson said late Monday he expects the House briefing to have a different "tone" in the light of the ceasefire. Though, the events overnight will likely raise even more questions from members of Congress.

-ABC News' 'Lauren Peller and Allison Pecorin