this is a president who is atcking allies with whom -- our allies don't turn to us and don't go along when we make request of him. >> president trump is on this potential history making trip. he is still hammering prime minister justin trudeau on twitter. the most recent tweets are calling him meek and mild and dishonest. here is how the german foreign minister responded. in a matter of seconds you can destroy trust with 280 twitter characters. to build that up will take much longer. what do you think is the lasting impact of the president's tweets? >> the challenge will be for the united states to prove that it really shares goals with some of our fundamental allies. this is a time add we global