Ahead, we break down the implications of that decision and what could come next.
A Twitter feud that erupted this week between Trump and Corker could complicate the efforts by the influential Republican to broker a deal that would likely require both Democratic and Republican support.
"If we pass the message that with every change of administration in Washington or elsewhere deals are thrown away and renegotiated, no one would negotiate with any administration ever and any deal would be exposed to be renegotiated every term". The law was meant to give Congress an oversight role over the nuclear deal.
"As flawed as the deal is, I believe we must now enforce the hell out of it", said the California lawmaker.
"If it was up to me, I would have had them noncompliant 180 days ago", he told the Wall Street Journal shortly after certifying the deal in July. Secretary of State Rex Tillerson and U.S. Ambassador to the U.N. Nikki Haley have said the U.S. interprets the agreement differently than the other countries involved.
Trump's speech will include a list of allegations of malign Iranian behaviour, focusing on its ballistic missile programme, its role propping up the Syrian regime of Bashar al-Assad and its support for the Lebanese Shia militia, Hezbullah.
However, Trump is not expected to call on lawmakers to revive those sanctions.
President Trump's upcoming decision on how he will deal with the unsafe and flawed nuclear agreement is a moment for moral clarity and may be a defining moment of his presidency. If he does refuse to certify, Congress would have 60 days to decide whether to renew sanctions lifted in exchange for Iranian nuclear compliance. But that's something no one on Capitol Hill seems inclined to do.
Iran has already threatened the U.S. with dire consequences if it imposes sanctions against the country.
The White House is seeking to extend or eliminate the expiration date for so-called "sunset" provisions, which limit the amount of uranium Iran is allowed to enrich.
Notably, the committee's top Republican, Rep. Ed Royce, said the US should adhere to the deal.
"That's what we have to consider", said Rep. C.A. Dutch Ruppelsburger, D-Md., the former top-ranking Democrat on the House Intelligence Committee. "Once it was entered into, once it was implemented, we want to see it enforced".
It's not clear whether America's European allies would go along with a renegotiation, either.
Connecticut Senator Chris Murphy today urged the president not to decertify the Iran nuclear deal.
Watch Federica Mogherini's full interview with the NewsHour's Judy Woodruff on Wednesday.
Even so, some experts told CNBC that decertification will undermine the global deal and encourage hardliners in Tehran to push for nuclear weapons.
Why does U.S. President Donald Trump want to scrap it? That could include Iran pulling out of the deal as well and restarting uranium enrichment activities, or Iran could stay in the deal and try to drive a wedge between the USA and its allies.
House Foreign Affairs Committee Chairman Ed Royce, R-Calif., who held a hearing on Iranian threats on Wednesday, called the deal a failed "gamble" that Iran would become a responsible actor. He would not say whether he would be open to other changes, stressing new conditions might violate the deal.
The Europeans seem more inclined to try to "build" on the deal in this way.
But it could be hard to get both Iran and its ally, Russia, back to the table for a new round of talks.
US President Donald Trump's team now faces an October 15 deadline to tell Congress whether it will continue to certify that Iran is complying with the deal.
What exactly that will look like is still being determined, but it could include greater congressional oversight.
The 2017 hurricane season was forecast by NOAA, and many other forecast products to be the busiest we have seen since 2010. It certainly looked like a hurricane from satellite images, with a ragged eye visible on Wednesday morning.
The warrant against Harris stems from accusations that he attacked someone, which led to the beating inside the garage. Video of the incident shows Harris on the ground being violently kicked and beaten with poles by several attackers.
Under the Reagan Administration, the U.S. quit UNESCO in 1984, at the time accusing the agency of a pro- Soviet Union bias. The United Nation's education, cultural and scientific agency has passed several resolutions against Israel.
Moreno Ocampo wanted to embed Jolie and Pitt with US Special Forces close to Kony's stronghold, according to the report. Is it that Brad will go with you? Neither the ICC nor Jolie's reps responded to PEOPLE's requests for comment.
Markey asked Pai to "publicly refuse to challenge the license of any broadcaster because the president dislikes its coverage". It was the same meeting where Secretary of State Rex Tillerson also reportedly called Trump a " moron ".
Earlier, Behrendorff took three wickets in the space of eight balls to stun the capacity crowd at the Barsapara Stadium. India captain Virat Kohli was on Tuesday dismissed for a duck for the first time in his Twenty20 worldwide career.
Samsung has some of the sharpest displays in the phone business, with both models of the S8 boasting a resolution of 2960 x 1440. Still, other manufacturers such as Samsung have managed to keep the headphone jack while including the features noted above.
The video was posted to the Facebook page of Cronulla Real Estate , the company Hatheier works for when not wrestling sharks. Huge cheers could be heard in the background as she succeeded in lifting the shark up and threw it back into the sea.
In Saturday's game, Logan Forsythe helped lead the charge as he was 3-for-5 with a stolen base, three runs and an RBI. The Diamondbacks went from 69-93 a year ago to 93-69, a wild-card game win over Colorado and a place in the NLDS.
Face ID technology may be coming to iPad Pro
But once the iPhone X manufacturing issues are resolved, the phone's sales will likely to pick up in the first half of 2018. Hopefully that will give Apple time to solve the Face ID-related supply chain issues that have been hounding the iPhone X.
Kante ruled out of France's final World Cup qualifier
That surpassed Raymond Domenech's 41 wins from 71 games (2004-2010) and Michel Hidalgo's equal mark from 75 encounters (1976-84). We have youngsters who have a huge amount of talent and the older players are still on it.
World's first PS4 controller-operated Nissan GT-R
A Racelogic VBox Motorsport sensor relays speed data to the "remote" driver. "This was once-in-a-lifetime, truly epic stuff". After this demonstration run, Nissan will tour the GT-R/C around schools in the United Kingdom to promote STEM education.
Hat-Trick Hero Messi Comments On Superb Display
That would be disaster for a number of reasons, as it would mean Lionel Messi will not be playing in Russian Federation . This was the match where Messi overtook Telmo Zarra as the player with the most hat-tricks ever in Spanish football.
Twitter to Introduce a New Bookmarking Tool
Using #SaveForLater , Twitter product manager Jesar Shah tweeted a GIF of an early prototype of the bookmarking process. Twitter hasn't announced a release date for the upcoming feature , but you should expect updates in the coming weeks.
Liverpool's Mane out for up to six weeks
His form since making the switch to Anfield has earned him a place on France Football's 30-man shortlist for the Ballon d'Or. Liverpool have announced that Sadio Mane could be out for up to six weeks after picking up an injury on global duty.
'Only One Thing Will Work' Against North Korea
He tweeted about it again, this time decrying 25 years of U.S. foreign policy in dealing with the perceived North Korean threat. Kim Jong Un also visited the mausoleum where his father and grandfather, "eternal president" Kim Il Sung, lie in state.
India bans firecrackers in bid to curb Diwali festival smog
After the Supreme Court decision, shutters came down on at least 30 shops selling firecrackers in the massive old Delhi market. The apex court was hearing a plea seeking restoration of its last year's order banning the sale of firecrackers in Delhi-NCR.