Just heard on the news last night that the US is almost 8 trillion in debt

the interest payment is a BIG 322 billion a year. By the way those were last year's fugures. This year, as we all know, the numbers are much bigger

What happens when the foreign governments stop loaning us money buy not buying our treasury bills? Even if they continue to buy the treasury bills, what do you think the impacts are to our economy with these HUGE debts and interest payments?