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

House Speaker Mike Johnson was briefed ahead of the U.S. strikes on Iran's nuclear sites, a source familiar with the briefing told ABC News.

Johnson was supposed to be in Israel on Sunday to address the Knesset, but the trip was scrapped because of the ongoing conflict.

The speaker also put out a statement endorsing the strikes, calling it a "decisive" action that prevents terrorism.

Senate Majority Leader John Thune was also briefed ahead of the U.S. strikes on Iran, two sources familiar with the conversation told ABC News.

"The regime in Iran, which has committed itself to bringing ‘death to America’ and wiping Israel off the map, has rejected all diplomatic pathways to peace. The mullahs’ misguided pursuit of nuclear weapons must be stopped," Thune said in a statement.

-ABC News' Kelsey Walsh and Rachel Scott

The NYPD announced that "out of an abundance of caution," it was sending more resources, "to religious, cultural, and diplomatic sites across NYC and coordinating with our federal partners."

-ABC News' Aaron Katersky

Secretary of State and National Security Adviser Marco Rubio was seen on the phone outside of the West Wing on West Executive Drive as the president's social media post on the attacks went live.

Moments later, his team including senior director for counterterrorism Sebastian Gorka, Deputy Chief of Staff James Blair and others, were seen gathered outside.

-ABC News' Kelsey Walsh

Trump announced on his social media platform that he would address the nation at 10 p.m. ET to discuss the attack.

"This is an HISTORIC MOMENT FOR THE UNITED STATES OF AMERICA, ISRAEL, AND THE WORLD. IRAN MUST NOW AGREE TO END THIS WAR. THANK YOU!" he said.