Conservative MP Alun Cairns told ITV News that a report on official migration statistics shows there is a significant margin for error in the way the data is collected.
He said: "We need to be confident the data is absolutely robust. The Government can be assessed on the trends, they can claim some sort of success, but to be confident about the absolute numbers on which this public policy is based we need to have more robust data."
Cairns suggested these measures:
- Home Office to collect more data and ensure data on Visas etc. is compatible
- Use e-Border controls more efficiently to ensure that that data is fed in
- Compare e-Border data with Office of National Statistics
- Compare e-Border data with information from overseas nations
More top news
Questions on Russia and Syria are sure to dominate Defence Secretary Michael Fallon's meeting with his US counterpart Ash Carter.
Smoking could kill two million Chinese in 2030 with the country facing a "growing epidemic of premature death from tobacco".
A great-great-great-grandmother has become an unlikely star at the age of 93 after her grandson shared a video of her dancing to rap music.