He argued that the gap between the number of new jobs created and the household survey from which the unemployment rate is derived is too large. (Wonkblog explains here why the numbers are what they are.) “I am doing nothing more than raising the question,” Welch told the Journal. “It’s fact-based.”
In an interview with MSNBC later in the day, Welch admitted that he had "no evidence" to back up his claim but again argued that the numbers simply don't add up.