The Islamic Revolutionary Guard Corps said in a statement published on Wednesday that the "regional war will this time extend beyond the region" if U.S.-Israeli attacks on Iran resume.

"Although they attacked us with the full capabilities of two of the most expensive armies in the world, we did not deploy all the capacities of the Islamic Revolution against them," the IRGC said in its statement, which was published by the semi-official Tasnim News Agency.

"We are men of war. You will witness our strength on the battlefield, not in hollow statements or virtual pages," the IRGC added.

-ABC News' Joe Simonetti

Iranian Foreign Minister Abbas Araghchi said in a post to social media on Tuesday that Tehran is preparing new military capabilities in the event that war with the U.S. and Israel resumes.

"With lessons learned and knowledge we gained, return to war will feature many more surprises," Araghchi said, referring to the first round of fighting which began with joint U.S.-Israeli strikes on Iran on Feb. 28.

President Donald Trump once again downplayed the war’s economic impact on Americans, saying that the financial setbacks are "peanuts" compared to the chance of Iran having a nuclear weapon.

"Everything's going good. I'm sorry, but we have to go down and take a little journey down to --we have to do something with Iran," Trump said in response to a question about high gas prices during an event showing the construction of the White House ballroom. "We cannot let them have a nuclear weapon. You want to see the world exploded? You want to see a problem? And this is peanuts."

The president, who has brushed off concerns about high prices, said "I appreciate everybody putting up with it for a little while. It won't be much longer."

He said that Americans “fully understand” his decision to carry out the war in Iran, adding that an abundance of oil is coming to the U.S. to quell concerns.

-ABC News' Isabella Murray and Michelle Stoddart

The Senate narrowly advanced an Iran war powers resolution Tuesday by a vote of 50-47 -- marking the first time the Senate has approved moving forward with this resolution after seven previously failed votes.

Republican Sen. Bill Cassidy, who lost his primary in Louisiana over the weekend after President Donald Trump endorsed his opponent, voted yes to advance the resolution for the first time. He has not yet issued a statement explaining his change in position on the measure.

His GOP colleagues Sens. Rand Paul, Susan Collins, and Lisa Murkowski also voted for the resolution, along with the majority of Democrats. There were multiple GOP absences.

As in past votes, Democratic Sen. John Fetterman was the only Democrat to vote against the resolution.

The resolution "directs the President to remove U.S. Armed Forces from hostilities within or against Iran unless a declaration of war or authorization to use military force for such purpose has been enacted."

The resolution only needed a simple majority in the procedural vote to advance. The Senate would need to vote again to advance the bill. Right now, if no other member changes their votes and there is full GOP attendance, the measure would still ultimately fail. Though it's a breakthrough moment for Democrats who have for months been bringing war powers resolutions to the floor.

"It sort of feels like the momentum is slowly, not fast enough for me, but moving our way, and that's really positive," Sen. Tim Kaine, who has been leading the Democratic effort on war powers, told reporters after the vote.

-ABC News' Allison Pecorin and Lalee Ibssa

Secretary of State Marco Rubio said on Sunday that the U.S. has made "significant progress" in discussions related to Iran, while stressing the "ultimate goal is that Iran can never have a nuclear weapon."

Speaking during his visit to India in a press conference with Indian External Affairs Minister Subrahmanyam Jaishankar, Rubio said that additional developments could come later on Sunday.

Rubio added that the administration has worked with Gulf regional partners over the last 48 hours on a possible framework aimed at keeping international waterways open and addressing concerns surrounding Iran's nuclear ambitions.

"We think we've made some progress on the outline of something that, if it works, could give us that outcome," Rubio said, while cautioning that any agreement would still require "full Iranian acceptance, and then compliance."

He also condemned Iranian threats against commercial shipping routes, calling such actions "illegal under any concept of international law."

Rubio defended President Donald Trump's record on Iran, stating "there is no one who has been stronger on this issue than President Trump," dismissing suggestions that the administration would agree to any arrangement that strengthens Iran's nuclear capabilities.

"The idea that somehow this president, given everything he's already proven he's willing to do, is going to somehow agree to a deal that ultimately winds up putting Iran in a stronger position when it comes to nuclear ambitions is absurd," Rubio said.

Rubio closed his remarks by expressing cautious optimism, saying "perhaps there is the possibility that over the next few hours the world will get some good news."

-ABC News' Rebecca Gelpi-Ufret