The White House had been preparing to reveal on Wednesday a joint venture between General Motors and Ventec Life Systems that would allow for the production of as many as 80,000 desperately needed ventilators to respond to an escalating pandemic when word suddenly came down that the announcement was off.

The decision to cancel the announcement, government officials say, came after the Federal Emergency Management Agency said it needed more time to assess whether the estimated cost was prohibitive. That price tag was more than $1 billion, with several hundred million dollars to be paid upfront to General Motors to retool a car parts plant in Kokomo, Ind., where the ventilators would be made with Ventec’s technology…

Two officials said the suggestion to wait on the General Motors offer came from Col. Patrick Work, who is working at FEMA. Some government officials expressed concern about the possibility of ordering too many ventilators, leaving them with an expensive surplus.