'You have thousands and thousands of people pouring into our various countries and spreading throughout, and in many cases we have no idea who they are. We must be tough, we must be strong and we must be vigilant,' the president told them.
And he groused that 'NATO members must finally contribute their fair share and meet their financial obligations.'
'Twenty-three of the 28 member nations are still not paying what they should be paying,' he said, 'and what they are supposed to be paying, for their defense.'
'This is not fair to the people and taxpayers of the United States,' he said, 'and many of these nations owe massive amounts of money for past years.'