The White House has officially declared an imminent government shutdown after the Senate failed to pass a GOP-backed spending bill to keep federal agencies funded through Nov. 21.

A memo issued by the Office of Management and Budget (OMB) said current federal funding levels "expire at 11:59 pm tonight."

"Unfortunately, Democrat senators are blocking passage of H.R. 5371 in the Senate due to Democrats' insane policy demands, which include $1 trillion in new spending," the memo said.

This news is breaking and will be updated.