>>510168288
>budget surplus for the month of June
The US regularly runs surpluses for individual months. Here you can find all monthly surpluses since 1980
https://fred.stlouisfed.org/series/MTSDS133FMS
The US ran a surplus for the month of June in, for example, the years 2005, 2006, 2008, 2013, 2014, 2015 and 2016. It's a common occurrence, and I think it's mostly due to calendar effects.