Earlier Mr Trump announced that he'd spoken to Mr Turnbull and the two nations were working on a deal to provide an exemption to the tariffs.
The exemption follows months of lobbying at the highest levels of the Trump administration from Mr Turnbull, his senior ministers and Australia's Ambassador Joe Hockey.
The United States and Australia are working on a "security agreement" that would allow Australia to escape steel and aluminum tariffs set to kick in on March 23, President Trump said on Friday.
The Australian government's urgency rose after the USA president announced that he meant to enact the tariffs as a remedy to trade imbalances.
"Thank you for confirming new tariffs won't have to be imposed on Australian steel & aluminum - good for jobs in Australia and in U.S.!"
President Donald Trump has suggested that Australia could be exempt from a move by the United States to impose heavy tariffs on steel and aluminum imports.
Turnbull soon replied with his own tweet, saying Australia had "no closer ally" than the US.
After a telephone call with Turnbull on Friday, Trump tweeted: "Spoke to PM @TurnbullMalcolm of Australia".
He excluded Mexico and Canada, as long as they negotiate a new North American Free Trade Agreement, and threw the door open to further exclusions for countries and niche products. "It's a level playing field and, in fact, the USA has a large trade surplus with Australia".
"My expectation is there may be some other countries [Trump] considers in the next two weeks", Mnuchin said on CNBC.
Any exemptions would ultimately be a decision for Trump, Ciobo said.
He said the threat of Australia sustaining collateral damage in a trade war also remained real.
"History tells us they are bad, and they end up causing not just a contraction in global trade but, as a result of that, a contraction in global growth", he told ABC on Saturday.
But he urged Mr Turnbull to put in place measures to prevent foreign steel, which was destined for the United States, from being "dumped" in Australia at below-cost prices.
Australia is a small global exporter of steel despite being one of the world's largest suppliers of the raw commodity iron ore.
"You've got to remember America wants a steel tariff ... and there might be retaliation from other countries ... it might have an adverse impact on Western Australia due to the tens of thousands of jobs that rely upon our iron ore industry", he said.
Personnel in hazmat suits work to secure a tent covering a bench where Sergei Skripal and his daughter were found critically ill . A police officer who responded at the scene is also in serious condition and is being treated in intensive care.
There will be seven other very good teams-maybe four of them will be from England, which doesn't make to easier, to be honest. Manchester City will contest a Champions League quarter-final after beating FC Basel in the last 16.
There are now no details about the test, but we'd imagine it'll take place next month, probably over the course of a weekend. It does make me wonder whether or not we might see the inclusion of the Solaire of Astora in Super Smash Bros on Switch .
Bottom line: NASA's Parker Solar Probe - launching summer 2018 - will travel closer to the sun than any spacecraft yet. The rocket speed is so quick, at its nearest approach it will go at roughly 430,000 miles per hour .
South Korea, the third largest steel exporter to the United States and a strategic ally on the Korean peninsula, called for calm. She did not say what level of tariffs the European Union would set, leaving it unclear what the economic impact would be.
Shkreli, known for his arrogant persona, broke down into tears and told the courtroom not to feel sorry for him. Its essence is instead about "repeated breaches of trust" and "repeated lies to his investors".
The Health Ministry in Gaza also reported three wounded in clashes by the border with Israel , one severely and two moderately. When the security coordinator arrived at the scene, his vehicle was pelted with stones, the spokesman said.
Reports have suggested Neymar is unsettled at PSG, with Madrid regularly linked to a move for the forward since he left LaLiga. The Brazilian has been out of action since being on the end of a bad tackle against Marseille on February 25.
This means that users will be able to play the game with their friends regardless of which device they're playing on. It will require a bit of a higher-end device, but it will offer the exact same game as on other platforms.
US citizens are warned not to travel to five Mexican states including Colima, Guerrero, Michoacán, Sinaloa, and Tamaulipas. It warns that some areas are experiencing violent crime such as homicide, kidnapping, carjacking, and robbery.
Explore Google Maps with Mario Kart on MAR10 Day
Furthermore, Nintendo announced that Super Mario Run's one-time payment will be at half price starting today until March 25, 2018. It appears that the Mario Day Easter egg has already begun to roll out to everyone, so expect to see it on your app soon.
Single market row at Scottish Labour conference
Mr Corbyn recently said he now favours the United Kingdom remaining in a customs union after Brexit. We must begin the process of tackling the institutionalised anti-Semitism in the Labour Party.
US 'a long way' from talks with North Korea
It was learnt that the Chinese government has pumped billions into infrastructure projects across Africa. The reporter said the comment, which Trump has denied, "is something that Africa's still digesting".
Putin Praises Trump as Ready Partner, Blasts US 'System'
But as a citizen of Russia and the head of Russian state I would ask: "What is such a world for, if there were no Russia?" The former KGB agent promised he hadn't tried to "turn" Melania Trump, "no, I stopped doing that a long time ago".
Oil prices edge up as U.S. dollar weakens
Still, the EIA's total domestic crude production figure hit a fresh weekly record at 10.369 million barrels a day for last week. As of 1633 GMT, front month West Texas Intermediate crude oil futures were lower by 0.76% at $62.10 a barrel on the ICE.