If the United States of America does not have enough money to do something then it should not do it. Inflation may kick in if we print money that we do not have enough of. Inflation is something that is quite bad that we should not do because it can mess things up.
Printing money increases inflation, devaluing currency in circulation home and abroad. Inflation also increases interest rates on domestic and international loans. Our nation's debt ceiling has been extended but the time will come again when we face the risk of defaulting on our own loans thanks to devauled currency. Our economy is slowly recovering and printing money works against growth.