Thoughtful pol leaders worldwide are holding off on commenting on the the BREXIT vote - but nobody ever accused Trump of being thoughtful or of being a leader.
How much the BREXIT vote hurts the EU is yet to be determined - the UK is the second-largest economy in the EU; Germany is the largest.
The harm may be felt inside the UK - UK students attending universities outside the UK could be effected, UK workers holding jobs outside the UK could be effected. But perhaps the most serious effect will be trade deals the UK has with other countries that will have to be re-negotiated and with the UK outside the EU and losing the clout of being in a 28-member club, it probably will get hurt - the UK now as a small independent country will go to the back of the cue.
France's right-wing pol Marine LePenn, who many compare to Donald Trump, is riding the wave of migrant resentment in France is making noise about a FREXIT.