I made a point of searching for Rubio's comments regarding China and I don't have any argument. However, that doesn't do anything to mitigate the stance being taken against allies. And, again, that plays into Beijing's and Moscow's hands.
Sales relationships between sellers and customers is related to - but not the same as - trade deals between/amongst countries. His bombast may be intended to deflect from what he really wants, but his "opponents" also have options. I'm convinced that he wants tariffs, because he wants tariffs. It has little or nothing to do with migrants, narcotics or trade deficits. It's astonishing that he has such a parochial understanding of international trade.
Trade deficit: what is it, and what does it mean for Canada and the U.S. - Fernie BC News
Many people may be ranting about his raving, but in the end, it won't be those people doing the negotiating. He behaved in a similar manner during his last term and it didn't gain him much. He is dialing up the rhetoric this time - I can only guess that he believes being more obnoxious will gain him more. The jury is out on that.
If he implements tariffs as threatened, be prepared for stormy weather, as there will be retaliation.