The federal government's gap grew to $665.7 billion in the 12 months through September 30, compared with a $585.6 billion shortfall in fiscal 2016, the Treasury Department said Friday in a report released in Washington. That was in line with the Congressional Budget Office's estimate of $668 billion, Bloomberg reports.

Treasury Secretary Steven Mnuchin and Budget Director Mick Mulvaney, in a statement accompanying the report, blamed weaker-than-expected tax receipts on historically "sub-par" economic growth.

"These numbers should serve as a smoke alarm for Washington, a reminder that we need to grow our economy again and get our fiscal house in order," Mulvaney said in the statement. "We can do that through smart spending restraint, tax reform, and cutting red tape."

Read alsoGroysman: Ukraine's state budget-2018 provides for UAH 165 bln for defenseCongress could be on track to worsen the deficit situation, according to most economic growth assumptions. The Senate on Thursday night approved a budget resolution that would fast-track up to $1.5 trillion in tax cuts through Congress this year.

Republicans say that the reductions will pay for themselves through faster economic growth. While the budget claims to reach a balance in 10 years through $5 trillion in spending cuts, those reductions are not spelled out and there is no mechanism for speeding them into law.

In the 2017 fiscal year, revenue totaled $3.31 trillion compared with $3.27 trillion a year earlier. Government spending was $3.98 trillion after $3.85 trillion in fiscal 2016.

For September, which is the final month in the fiscal calendar, the government reported an $8 billion surplus. That was lower than the $33.4 billion surplus a year earlier.