Migrants convicted of sex offences in the UK or overseas will be unable to claim asylum under government plans to change the law to improve border security.

The Home Office announcement means foreign nationals who are added to the sex offenders register will forfeit their rights to protection under the Refugee Convention.

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As part of the 1951 UN treaty, countries are allowed to refuse asylum to terrorists, war criminals and individuals convicted of a “particularly serious crime” – which is currently defined in UK law as an offence carrying a sentence of 12 months or more.

The government now plans to extend that definition to include all individuals added to the Sex Offenders’ Register, regardless of the length of sentence, in an amendment to the Border Security, Asylum and Immigration Bill, which is currently going through parliament. It’s understood they also hope to include those convicted of equivalent crimes overseas.

Those affected will still be able to appeal their removal from the UK in the courts under the European Convention on Human Rights (ECHR).

It is unclear how many asylum seekers will be affected, as the government has been unable to provide any projections or past data on the number of asylum seekers added to the Sex Offenders’ Register.

Home Secretary Yvette Cooper said: “Sex offenders who pose a risk to the community should not be allowed to benefit from refugee protections in the UK.

“We are strengthening the law to ensure these appalling crimes are taken seriously.”

Safeguarding and Violence Against Women and Girls Minister Jess Philips said: “We are determined to achieve our mission of halving violence against women and girls in a decade.

“That’s exactly why we are taking action to ensure there are robust safeguards across the system, including by clamping down on foreign criminals who commit heinous crimes like sex offences.”

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The Home Office would like voters to see this as a substantial change. But that’s hard to demonstrate without providing any indication of the scale of the problem it seeks to solve.

Clearly, the government does not want to fan the flames of resentment towards asylum seekers by implying large numbers have been committing sex crimes.

But amid rising voter frustration about the government’s grip on the issue, and under pressure from Reform – this measure is about signalling it is prepared to take tough action.

Conservatives: ‘Too little, too late’

The Conservatives claim Labour are engaged in “pre-election posturing”.

Chris Philp MP, the shadow home secretary, said: “This is too little, too late from a Labour government that has scrapped our deterrent and overseen the worst year ever for small boat crossings – with a record 10,000 people crossing this year already.

“Foreign criminals pose a danger to British citizens and must be removed, but so often this is frustrated by spurious legal claims based on human rights claims, not asylum claims.”

The Home Office has also announced plans to introduce a 24-week target for appeal hearings (known as “first-tier tribunals”) to be held for rejected asylum seekers living in taxpayer-supported accommodation, or for foreign national offenders.

The current average wait is 50 weeks. The idea is to cut the asylum backlog and save taxpayers money – Labour have committed to end the use of asylum hotels by the end of this parliament.

It’s unclear how exactly this will be achieved, although a number of additional court days have already been announced.

The government also plans to crack down on fake immigration lawyers who advise migrants on how to lodge fraudulent asylum claims, with the Immigration Advice Authority given new powers to issue fines of up to £15,000.