"Supply chain is one of the big challenges for U.S. expansion," Woo said. "In addition, any manufacturing we take back to the U.S. needs to leverage high-value engineering talent there in comparison to the low-cost labor of China."
Foxconn currently has factories in California and Texas involved in the assembly of products such as servers.
"I don't think we have a responsibility to create a certain kind of job," Cook said. "But I think we do have a responsibility to create jobs."
"When you back up and look at Apple's effect on job creation in the United States, we estimate that we've created more than 600,000 jobs now," he added.
Apple doesn't make a secret about where its products are made. On the back of many Apple products are the words "Designed by Apple in California. Assembled in China." The company has, however, been criticized for manufacturing products abroad, and the company hasn't manufactured a single product in the U.S. since the 1990s.