"With this action we're sending a strong signal to the world".
The Australian visa programme - 457 visa - is used to employ skilled foreign workers.
The document will bring in major changes regarding the H1B visa program, including closing loopholes for immigration fraud and a shift from the current lottery system to a mechanism that favors higher paid and higher skilled workers.
Korea unveils new ICBM at military parade
In February China banned all imports of North Korean coal, which is a lucrative source of income for the country. At the other end of the spectrum, they looked at the notion of accepting North Korea as a nuclear state.
Trump has said he would like to reform the U.S. immigration system, including the H1-B visas, but has so far focused most of his attention on cracking down on illegal immigration, with greater immigration enforcement and a proposed border wall with Mexico.
Mr Trump's wife Melania used an H-1B visa in her early days as a model in NY, says the BBC's Gary O'Donoghue in Washington.
President Donald Trump's latest executive order focuses on the way the federal government gives visas to highly trained foreign workers.
The moves show Mr Trump once again using his power to issue executive orders to try to fulfil promises he made previous year in his election campaign, in this case to reform U.S. immigration policies and encourage purchases of American products.
The number of requests for H-1B visas declined this year by about 15 percent, or roughly 37,000 applications, but the total was still almost 200,000, far more than the 85,000 limit.
Secret Service beefs up barriers at White House
On the map below, the upper arc represents the old fence line; the lower arc represents the new boundary for the public. Secret Service Communications Director Cathy Milhoan said on Wednesday "that vantage point.is still there".
These forthcoming administrative and legislative measures will specially target the H-1B visa programme under which Indian technology companies bring thousands of computer professionals to the US every year.
The order does nothing specifically to NAFTA for now, but a senior Trump administration official said the US will be doing analysis on the deal to see if it's meeting the "Trump standard of fairness and reciprocity".
The official added, 'these companies will apply for a large number of applications every year by putting additional tickets in lottery raffle. The White House argues that some companies undercut American workers by bringing in cheaper foreign labour on a temporary basis. Specifically, they would look into whether waivers in free-trade agreements are leading to unfair trade by companies outside the USA and whether it undercuts American companies on a global playing field.
The staffing companies then sell their services to corporate clients who use them to outsource tech work.
Tillerson warns 'unchecked Iran' could be as bad as North Korea
However, Tillerson branded the deal a failure, as Trump ordered a review of how the U.S. is countering the threat from Iran. The disagreement between Obama and Netanyahu over the deal had strained US-Israel ties and Obama-Netanyahu relationship.