LOL, of course the surplus is because of Republicans, the same GOP Congress that once they got power in 2001 with a GOP President, cut taxes twice, fought two wars, passed a new drug entitlement, and blew up the surplus they created under Clinton!
Rule #1 for conservatives is it's always the Democrats' fault, and anything good is credit to the GOP!
The truth is that Clinton raised taxes, which the GOP bitterly opposed and ran against and won Congress running against in 1994. That caused revenues to hit a record under Clinton as a share of GDP, about 20% of GDP, up from about 17% pre-Clinton. And with the GOP's help, spending growth was slowed considerably, but Clinton didn't oppose the spending cuts, and of course Bush and Cheney ran against the "Clinton" defense cuts in 2000. But, sure, having the GOP in opposition no doubt kept a lid on spending, but you cannot ignore the role of the Clinton tax increases either.
https://www.whitehouse.gov/omb/historical-tables/ Table 1.3 has inflation adjusted numbers.
In inflation adjusted numbers, revenues increased from roughly $1.6T to $2.4T under Clinton, or about +50%. Expenditures only increased by about $200B from 2.0 to 2.2 Trillion.
With Bush, even at the top of the bubble with unsustainable collections, revenues only increased by $200B (<10%) and expenditures by $600B. That's what two rounds of tax cuts gets us - revenues barely move, even at the top of a massive bubble. With the 1 year exception of the peak bubble year of 2007, It took until 2013 to match collections in the last year of Clinton, 2001. Thanks GOP tax cuts!