In an interview on CNBC's "Halftime Report," Fields said the decision not move forward with its San Luis Potosi, Mexico, plant was due to market demand.
"The bottom line is we're not seeing the volume and the demand that we expected for that plant. And, therefore, we're looking at our capacity and saying, 'You know what, we can build that in an existing facility and use capacity that we already have,'" he said.
"Over the last couple of years we've seen small cars markedly decline. Every year we're looking at our capacity. We're looking at our forecast for demand. It became very clear that we didn't need this plant."
On Tuesday, Ford announced it will instead invest $700 million in its Flat Rock, Michigan, plant and add 700 direct new jobs. The company said it will continue to build its Ford Focus at an existing plant in Hermosillo, Mexico, to improve company profitability.