Republican presidential candidate Jeb Bush said Wednesday that in order to grow the economy "people should work longer hours" -- a comment that the Bush campaign argues was a reference to underemployed part-time workers but which Democrats are already using to attack him.

During an interview that was live-streamed on the app Periscope, Bush told New Hampshire's The Union Leader that to grow the economy, "people should work longer hours."

He was answering a question about his plans for tax reform and responded:

"My aspiration for the country and I believe we can achieve it, is 4 percent growth as far as the eye can see. Which means we have to be a lot more productive, workforce participation has to rise from its all-time modern lows. It means that people need to work longer hours" and, through their productivity, gain more income for their families. That's the only way we're going to get out of this rut that we're in."

Already the Democratic National Committee has pounced, releasing a statement that calls his remarks "easily one of the most out-of-touch comments we've heard so far this cycle," adding that Bush would not fight for the middle class as president.