This is my post in a Trump tax cut discussion.
There are a lot countries which have high Debt/GDP ratio, China and Japan for example. But China GDP is growing at 6 to 7% pace which is a lot higher than US. US GDP has been growing at rate of 1.5 to 2% for the past 9 years. As long as you have a decent GDP, you should be able to service your national debt. That's why China can handle a higher debt ratio than US. We can handle our ratio of 100%, that is no question about it. But we can not handle if the ratio is too high . Trump can not just do the tax cut without any incoming revenue. Just use the 2% GDP growth is not enough to support his tax cut. If the tax cut goes through, we definitely will see the increase of our national debt which is $20 trillion at this point.