A top Trump administration economic advisor has a theory on the labor market freeze . Kevin Hassett, director of the National Economic Council, told CNBC's "Squawk Box" on Monday that AI may be pushing worker productivity so high that employers are stepping on the brakes on hiring. "There could be a little bit of, almost, quiet time in the labor market," Hassett told show host Joe Kernen, "Because firms are finding that AI is making their workers so productive that they don't necessarily have