I think invoking the Defense Production Act also pertains to Obama's executive order 13603 - there was an uproar then over him usurping power & eliminating FEMA response replacing w Homeland Security branches.
This from Forbes article after EO 13603
"Hopefully, President Obama will never try to implement his executive order 13603 – the plan for seizing control of our economy and our lives."
https: //www.forbes.com/sites/jimpowell/2012/04/29/obamas-plan-to-seize-control-of-our-economy-and-our-lives/#40e704112ee9