Actually, Obama added closer to 9 Trillion dollars to the debt that was at 12 Trillion after Bush. Trump has contributed at least 6 Trillion in Debt in his first term while he claims to add an additional 9 Trillion in his second term. In the last 30 years, only Clinton had managed to add less than 1.5 Trillion dollars in debt. The surest way to avoid default is to prevent budget deficits that lead to debt. The federal government must raise revenue through taxes or cut spending. But because Obama raised the debt to more than 100 percent of gross domestic product after 2011, it will be difficult for any future President to cut spending enough to reduce the debt without the risk of default. And who refuses to to raise the revenue through taxes? Republicans. True, they are both to blame and while the Democrats are incredibly unpopular with their solutions, they are, unfortunately, better than what the Republican option appears to be which is to increase spending until eventually the country defaults on it's debt and then blame the Democrats for it.