US can't defend Greenland 'for nothing,' former national security adviser says

Ambassador Robert O'Brien , Trump 's former national security advisor, joins CNN 's Jason Costello to discuss foreign affairs.

Ambassador O’Brien : President Trump has been very clear that there will be all hell to pay in the Middle East and especially targeted on Hamas .

He says the Hamas leaders both in Gaza and outside of Gaza , if they don't release the American hostages, my guess is they're going to end up like Baghdadi with a Belgian Malwa military working dog chasing them down a tunnel.

Donald Trump is the first person since Ronald Reagan to talk actively about Greenland .

Greenland is strategically very important to the Arctic , which is going to be the critical battleground of the, of the future.

The days of the US taxpayer defending Western Europe and the, and, the Kingdom of Denmark is in, in Europe and, and defending their empire for nothing are over.

Ambassador Robert O'Brien : America 's tech industry is under attack from the Chinese and Europeans .

O’Brien: President Trump is going to put a stop on both, both sides. Trust me about that on day one , he says.

Ambassador OBrien : In the long run, we win and they lose against China , but we've got it.