There are calls for a serious review into plans to spend £3bn moving a research centre almost 90 miles (144 km) across England.
John Glen, Conservative MP for Salisbury, said plans to move the UK Health Security Agency (UKHSA) campus to Harlow, in Essex, rather than using its existing Porton Down site in Wiltshire was a "redundant" plan.
More than £39m has already been spent on proposals for new site, where scientists would study deadly pathogens, which are disease-causing microorganisms.
Health minister Ashley Dalton said the government would announce its decision "in a matter of weeks", with a commitment "to sorting this issue out once and for all".
Mr Glen, whose Salisbury constituency is home to Porton Down, told the Commons that "Porton has remained instrumental in delivering translational health research for our nation".
The UKHSA's £27m Robinson Building opened in Wiltshire in 2022, one of two facilities that made up a new £65m vaccine evaluation centre during the Covid-19 pandemic.
Mr Glen said this decision "reinforced" his point and asked why such a "significant" capital investment was made if the centre was to be moved to Harlow.
He called for a "serious review of what is going on here" and continued: "Effectively what we're doing is clinging, I think, to a redundant plan."
