yup, a FEW countries like China are lending the US money so that they can buy their products. And one of the reasons China has a $347 BILLION trade surplus with the US.  But then Nobel Economist Laureate Dr. Krugman told Obama not to worry about the debt.  Depending on how you measure GDP the world's largest economy is either China or the US.  And yet Obama thought it was fine that China could receive funding under the Paris Climate Accord and could increase CO2 until 2030.  Makes you wonder!!!!!!!
What I didn't say earlier, if world interest rates rise or foreigners no longer fund the US debt (just 2 possibilities) there will be a serious financial crisis in the US.  And it will not be Trump, Obama, Meryle Streep, Tom Steyer etc who will not be able to afford health care or struggle to put food on the table.  In my opinion the risk of another financial meltdown is a lot greater than what Dr. Krugman believes.  But then he is an academic with little real life experience.