British Prime Minister Boris Johnson faces a threat to his leadership from rebels in his Conservative Party who are demanding a clear path out of the U.K.’s economically damaging lockdown.

Steve Baker, a senior rank-and-file member of Parliament, said in a letter to his Tory colleagues it could be a "disaster” if pandemic restrictions last until spring.

He urged them to contact Johnson’s team to warn that the premier’s position will be at risk unless he announces a route out of the current measures.