Israel is unlikely to carry out a strike on Iran until after Passover, a senior U.S. official told ABC News, although that could always change.

Passover begins on Monday and ends after nightfall on April 30.

The Iranian Islamic Revolutionary Guard Corps and other leadership are still on a high state of alert, with some in safe houses and underground facilities, the official said.

Israel prepared for and then aborted retaliatory strikes against Iran on at least two nights this past week, three Israeli sources told ABC News.

Iran attacked Israel with more than 300 drones and missiles on Saturday night into Sunday morning local time in Israel. Israel has been weighing how and when to respond to Iran's attack since then, holding war cabinet meetings on Sunday, Monday and Tuesday.

The members of the Israeli war cabinet are Israeli Prime Minister Benjamin Netanyahu, Minister Benny Gantz and Defense Minister Yoav Gallant.

A range of responses have been presented to the Israeli war cabinet. The potential responses include options ranging from attacking Iranian proxies in the region but not on Iranian soil to a potential cyber attack, sources told ABC News.

There was no war cabinet meeting on Wednesday, but Netanyahu told his government cabinet that while he appreciates the advice from allies, Israel will "make our own decisions, and the State of Israel will do everything necessary to defend itself."

-ABC News' Matt Gutman and Jordana Miller

Iranian President Ebrahim Raisi said at an army parade Wednesday that "the tiniest invasion" from Israel will be met with a "very massive and harsh response."

House Republicans have posted the legislative text for three national security bills, addressing Ukraine, Israel and the Indo-Pacific.

For Israel, lawmakers have crafted a package totaling $14.1 billion, including: $4 billion for missile defense; $1.2 billion for Iron Beam; $4 billion replenishment of stocks to the Department of Defense; and $3.5 billion for Israel to purchase U.S. weapons.

"The House must pass the package this week and the Senate should quickly follow," President Joe Biden said in a statement. "I will sign this into law immediately to send a message to the world: We stand with our friends, and we won’t let Iran or Russia succeed."

Votes are expected in the House on Thursday, Friday and Saturday.

Israeli military officials on Sunday said the Iranian attack had been "thwarted" by Israel and its allies, but warned that the threat of further strikes continued.

Most of the more than 300 drones, missiles and other threats Iran launched were intercepted by Israeli and allied defenses before entering Israel, the Israel Defense Forces said.

"99% of the threats launched towards Israeli territory were intercepted -- a very significant strategic achievement," IDF spokesperson Daniel Hagari said.

The military defense was coordinated with a group of international allies, including the United States, United Kingdom and France, Hagari said.

"This partnership has always been robust, but last night it was exceptionally evident," he said.

The attack included at least 170 uncrewed drones, none of which made it into Israeli territory, he said.

About 25 of the 30 cruise missiles launched were intercepted by Israeli fighter jets before entering Israel, Hagari said.

And more than 120 ballistic missiles were launched, with "only a few" striking targets within Israel, he said. Those that made it through struck Nevatim Air Force Base, causing "minor damage to infrastructure," he said. The base remained open, he added.

"However, it is important to say -- the event is not over," Hagari said. "We remain prepared and ready for further developments and threats."

-ABC News' Edward Szekeres and Kevin Shalvey