Eugene Kaspersky said in a statement on Friday
"I look forward to participating in the hearing once it's rescheduled and having the opportunity to address the committee's concerns directly," he said.
An appearance before Congress would mark Kaspersky's most high-profile attempt to dispel long-standing accusations that his firm may be conducting espionage on behalf of the Russian government.
The investigation into the 2015 NSA hack is focused on somebody who worked at the agency's Tailored Access Operations unit, a unit that uses computer hacking to gather intelligence, according to two people familiar with the classified probe.
Kaspersky anti-virus software was running on the contractor's laptop at the time of the hack, and investigators are looking into whether hackers used the software to breach the computer and steal the data, said one of those sources.
