Theresa May is being warned as many as 20 MPs could rebel in a bid to get Northern Ireland to follow the Republic and liberalise abortion laws.
Number 10 insists the issue of abortion in Northern Ireland, which is still illegal despite the UK 1967 Abortion Act, is one for the Northern Ireland Assembly.
But a group of Conservative MPs are believed to be following Equalities Minister Penny Mordaunt in calling for Westminster to take the decision.
The Times reports up to 20 Tory rebels could vote against the Prime Minster in the forthcoming Domestic Abuse Bill, which could be used as a vehicle to change the law in Northern Ireland.
Theresa May (pictured this week) is being warned as many as 20 MPs could rebel in a bid to get Northern Ireland to follow the Republic and liberalise abortion laws
The Government faces a tough week ahead as pressure mounts over the issue.
On Monday Northern Ireland Secretary Karen Bradley will face an urgent question in Parliament, followed by a debate lead by Labour MP Stella Creasy on Tuesday.
Come Thursday, Mrs May will have to deal with the result of Supreme Court bid launched last year to change Northern Irish laws on abortion on human rights grounds.
Mrs Bradley will also have to face campaigners in the region on the issue.
In Belfast Northern Irish politicians are desperately scrambling to re-establish a power-sharing agreement to ensure they continue to preside over the law.
After Stormont collapsed in January last year, Northern Ireland is considerably more vulnerable to Westminster interventions.
The Times reports the British-Irish Inter-Governmental Conference (BIIGC), set up as part of the Good Friday agreement in 1998, is in talks to re-establish a Government at Stormont and stop any UK intervention on abortion.
A group of Conservative MPs are believed to be following Equalities Minister Penny Mordaunt (pictured) in calling for Westminster to take the decision.
After two thirds of voters in Ireland