Donald Trump's nominee for army secretary Vincent Viola withdraws his name

US President Donald Trump's nominee for Army secretary, businessman Vincent Viola, has withdrawn his name from consideration for the post.

Defence Secretary James Mattis was disappointed but understood and respected Viola's decision, a Pentagon statement said. Mattis will recommend to Trump another candidate soon, the statement said.

A Trump administration official confirmed on Friday night that Viola had withdrawn. The official spoke on condition of anonymity because the official wasn't authorised to speak publicly.

The Military Times reported that Viola said in a statement he was "deeply honoured" to be nominated but cited his inability to successfully navigate the confirmation process and Defence Department rules concerning family businesses.

Viola was the founder of several businesses, including the electronic trading firm Virtu Financial. He also owns the National Hockey League's Florida Panthers and is a past chairman of the New York Mercantile Exchange.

A 1977 West Point graduate, Viola trained as an Airborne Ranger infantry officer and served in the 101st Airborne Division. In 2003, he founded and helped fund the Combating Terrorism Centre at West Point.