You might want to take a look at some real numbers HERE (
Is the US NATO's piggy bank? Here's what America gives and takes).
Did you know that the combined defence budgets for all of the NATO countries (excluding that of the United States of America) is over four times as great as the Russian defence budget?
Did you know that that would rise to approximately eight time the Russian defence budget if the NATO countries (not counting the US) spend 4% of their GDP on defence?
Did you know that NATO is concerned with the defence of Europe (plus Canada and the US) and is NOT concerned with the defence of Africa, Asia, Australia, South America, Central America, or the Pacific Islands?
Did you know that (according to the logic that Mr. Trump is using) the US does not spend a dime "defending" any part of Africa, Asia, Australia, Couth America, Central America, or the Pacific Islands because his position is based on the premise that ALL of the money that the US spends on defence is spent on NATO?
If you assume that Europe comprises 5% of the world and assume that US defence spending is spread evenly throughout the world, then that means that the US is spending approximately US$25,000,000,000 annually "defending Europe". The other NATO nations spend, collectively, around US$270,771,000,000 "defending Europe". Since the other NATO countries are spending around 10 times as much as the US is spending to "defend Europe" and since the GDP of the EU is smaller than that of the US, which of the two is not "paying their share of the costs of NATO"?
The statement
"Trump is suggesting then that Europe PAY their share of the costs of NATO."
is false and the correct statement is
"Mr. Trump is manipulating data so that the ignorant portion of the American electorate thinks that something that is already happening is not happening - in short, Mr. Trump is lying when he says that the European countries are not paying their share of the costs of NATO. What Mr. Trump really means is that the European countries are not subsidizing American defence spending to the degree that he would like to see them doing it AND that American defence spending is based on completely unrealistic 'determinations' of the 'threat level' which are produced for domestic partisan political purposes.".