LONDON — Prime Minister Boris Johnson is facing opposition from his own party as he prepares to ask British lawmakers to back plans for a second national lockdown to combat the exponential spread of COVID-19.

Johnson on Monday will provide the House of Commons with details of a proposed four-week lockdown scheduled to begin Thursday. The plan was hurriedly announced on Saturday after scientific advisers told the government that rapidly rising infection rates risked swamping English hospitals in a matter of weeks.

The opposition Labour Party has said it will support the legislation when it comes up for a vote on Wednesday, virtually assuring it will be approved. But members of Johnson’s Conservative party have expressed concerns about the economic damage that will be caused by a second national lockdown.

Graham Brady, chairman of an influential committee of Conservative lawmakers, said he wants the government to present a full assessment of the impact a lockdown will have on jobs, businesses and mental health before lawmakers are asked to vote on it.