The financial system is a target terrorists would like to disrupt with a cyberattack, so companies need to do the best they can to protect themselves, CME Group Chairman and CEO Terry Duffy told CNBC on Tuesday.
In fact, cybersecurity is one of his big concerns and CME spends a "tremendous amount of revenue" on it, he said.
"You can spend until you're blue in the face and still not protect everything. So you have to do the best job you possibly can," Duffy said in an interview with "Closing Bell."
"I'm concerned about the global financial system and keeping it protected," Mnuchin said at the Delivering Alpha conference, presented by CNBC and Institutional Investor.
Duffy said businesses need to remain vigilant and dedicate resources to protect themselves and their customers.
"It's incumbent upon all of us to make sure that we allocate the resources to defend our systems no different than governments have to allocate resources to NATO and others to protect our countries," he said.
— CNBC's Michael Sheetz and Todd Haselton contributed to this report.