Deal with it as it happens.  As and when the Dumpster lowers the US tax take we can follow suit.  The US is so far in debt at present after 15 years of non-stop war we should be able to out do them in tax reductions.  Sure our national debt will rise but not as fast as theirs.  If he is to believed, the Dumpster will start many such races to the bottom so why try to anticipate it?  Better to wait and see what he actually does and be quick to match it.