The timing and current day conditions tells us all we need to know. If this is some big safety concern of his, why now, why not in the past also?
Any law enforcement agency could do a clamp down on speeding, at any time, in the name if safety and “it’s the law”. Start writing tickets for 1 mile over the limit. That shouldn’t be construed as anything except a money grab and/or political statement. This deal is no different. I don’t think you really need to be walked through it. If you do, nobody should ever take you seriously again.
And BTW, I don’t fault him for sending busloads to DC. The feds failure to enact reasonable immigration reforms and lack of helping the states impacted seems to be a pretty good reason for it to me. But doing what he’s doing with the trucks now is just unconscionable. We don’t need more strains on the supply chain at this time.