US President Donald Trump has met with the heads of 18 US technology companies including Apple, Amazon, Microsoft and Alphabet, seeking their help to make the government's computing systems more efficient.

The White House wants to update government information technology systems, cut costs, eliminate waste and improve service. Trump has cited estimates that the government could save up to $US1 trillion over 10 years through such measures.

"Our goal is to lead a sweeping transformation of the federal government's technology that will deliver dramatically better services for citizens," Trump said. "Government needs to catch up with the technology revolution."

The executives are part of the so-called American Technology Council that Trump formed in May to support efforts to modernise the US government.

"The US should have the most modern government in the world. Today it doesn't," Apple CEO Tim Cook said.

Amazon CEO Jeff Bezos said he wanted the Trump administration to make use of commercially available technologies, worker retraining, machine learning and artificial intelligence.

Before meeting with Trump, the CEOs met in 10 small group sessions with Vice President Mike Pence, Treasury Secretary Steve Mnuchin and Commerce Secretary Wilbur Ross, along with the presidents of the Massachusetts Institute of Technology and Ohio State University.

Jared Kushner, Trump's son-in-law and adviser, said the administration wanted to "unleash the creativity of the private sector to provide citizen services in a way that has never happened before."

He said the administration was scrapping unneeded regulations for government computing systems, such as a rule on preventing Y2K issues. Most of the government's 6100 data centres can be consolidated and moved to a cloud-based storage system, he said.

Trump in March signed an order to overhaul the federal government and tapped Kushner to lead a White House Office of American Innovation to leverage business ideas and potentially privatise some government functions.

Others attending include Alphabet Executive Chairman Eric Schmidt, venture capital firm Kleiner Perkins Chairman John Doerr and the CEOs of Microsoft, IBM, Intel , Qualcomm, Oracle and Adobe. Facebook CEO Mark Zuckerberg was invited but could not attend because of a conflict, the company said.

A 2016 US Government Accountability Office report estimated the government spent more than $US0 billion in IT annually, excluding classified operations. In 2015, the US government made at least 7000 separate IT investments and some agencies were using systems that had components at least 50 years old. "This structure is unsustainable," Kushner said.

The CEOs and White House also planned to discuss Trump's review announced in April of the US visa program for bringing high-skilled foreign workers into the country. Cook planned to raise immigration, a person briefed on the matter said ahead of the meeting.

The council also seeks to boost the security of US government IT systems and wants to learn from private-sector practices. In 2015, hackers exposed the personal information of 22 million people from US government databases.

The White House thinks it can learn from credit card companies about significantly reducing fraud. A 2016 government audit found that in Medicaid alone there was $US29 billion in fraud in a single year.

Following Trump's June 1 decision to withdraw from the Paris climate accords, Tesla CEO Elon Musk and Walt Disney CEO Robert Iger stepped down from White House advisory panels. White House officials said the dispute had little impact and that they had to turn away tech leaders from Monday's event because of lack of space.

Reuters