Artificial intelligence could be increasing worker productivity so much that companies slow hiring , top Trump administration economic advisor Kevin Hassett said Monday. "I think that there have been mixed signals in the job market," the National Economic Council director said on CNBC's " Squawk Box ," adding that he has seen "really, really positive signals in the output markets." After noting U.S. gross domestic product rose at a strong pace in the second quarter of 2025, Hassett said, "there