The sportswear company's shares are down nearly 30 percent this year as it gave 2017 sales guidance below Wall Street expectations.
On the retail environment: "North American retail is in a very difficult place. I think we've looked at some things we can probably do better as well," he said. "Yeah the closures [from the Sports Authority bankruptcy] had an impact. … That combined with the promotional environment that had our two key competitors at one of our largest and best accounts [cut prices by] 40 and 50 percent off respectively."
On the border adjusted tax proposal: "The border tax would have an absolutely very, very difficult effect on all companies in the consumer space, particularly retailers," Plank said. "It's the No. 1 issue when you ask me about the new administration."
He also discusses:
- The company's earnings report
- President Donald Trump
- Stock price
- CFO departure
To watch the "Halftime Report" interview in its entirety, you must be a CNBC PRO subscriber.