Fire Americans, retain Europeans - research ?

WRT multinational corporations having major workforces in the USA and the European Union, I have heard anecdotically that they tend to fire Americans disproportionately over Europeans when facing a downturn. Apparently, this is because it is hard with Government regulation in the EU to fire people.

Questions :

  1. Is there good journalism articles covering this phenomenon in detail ? (Either confirming or negating)
  2. Is this on Trumps radar ?