Apple continues to deny a report its computer supply chain was hacked -- this time to lawmakers.
In a letter to the House and Senate commerce committees Sunday, the tech company said it found no evidence that microchips sold to Apple gave China access to spy on American systems.
The denial is in response to a Bloomberg Businessweek article that came out last week. It claims Apple and other tech companies' equipment was compromised by a supplier, Super Micro Computer, Inc.
National security officials have sided with Apple so far. Over the weekend, the Department of Homeland Security backed up the company, saying it had "no reason to doubt" Apple's denial. The UK's cyber security agency agreed.
Apple's top security officer has offered to brief lawmakers on its investigation into the Bloomberg report this week.