Europe should do that regardless of who is in the White House. For almost a century, the Europe has been acting like a colony of the US. EU in particular has the third largest economy in the world (almost the size of China), but they cannot defend themselves, they have stopped innovating and they basically have no soft party.I really feel like if the US elect Trump, Western European countries - especially the UK - need to seriously reassess our relationship with the US. If Trump gets in then it’s because a significant enough amount of voters actually endorse his politics and views, we can’t pretend it’s just a blip or a one off.
Whilst I am not saying that things should or will become actively adversarial with the US, Europe will need to become less reliant on them, especially for defence. It could also start to speed up the federalisation of the EU, as only a combined European entity will have the power and influence to stand up to the likes of China and the US (this is already my view - but Trump getting in could amplify and accelerate it all).
They are essentially a larger Japan.