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SDR stands for Special Drawing Rights, which are basically credits which can be exchanged for money. The IMF issues SDRs to member countries in need, to shore up their reserves.
Soros (and others) have long proposed using the existing SDR system as a transitional step to a full-fledged global currency system. Step one is to stop using the U.S. dollar as the world's reserve currency, and start using SDRs instead. Later, the SDR would be replaced by a "real" fiat currency issued by a global reserve bank.
In the article that greeneyes posted earlier, the writer, JC Collins, argues that President Trump is continuing to pursue a global bank/global currency agenda under the guise of his anti-Fed policy. In other words, Collins says Trump is beating up on the Fed, in order to clear the way for an SDR-driven global currency system.
I really don't know what to think about Collins's article. It seems like he's just speculating. In any case, I trust President Trump will do the right thing for the American people.
For more info, see greeneyes's followup post.
I agree with your evaluation. Everything Trump has done has been to improve the financial status of the lowly citizen. It seems to me that Trump is beating up on the Fed because they are prematurely pouring cold water on a bubbling economy. As 'hot' as it seems it is still fragile. In a global environment we cannot expect to 'explode' at the expense of foreign trade.
As I understand it, we have been the world's reserve currency because the Arabs have agreed to value crude oil by the dollar. Should such a dynamic suddenly change, I worry about our $22+ tril debt. OTOH, I heard most of my life that if the U.S. economy gets a cough the rest of the world gets a cold. :^)