Ex-Prime Minister Sir John Major has said he is “wary” about a planned deal between the Conservatives and the Democratic Unionist Party.
The leader of the DUP, Arlene Foster is in No 10 talks with Theresa May, over supporting a minority Tory government.
The BBC understands a deal looks set to be finalised within the next 24 hours.
But former Conservative PM Sir John said he was “dubious” about the proposed deal and its impact on devolution and the peace process.
He told BBC Radio 4’s World at One that if the Conservatives “locked” themselves into a deal with one of the main parties in Northern Ireland, there was a danger the government would no longer be seen as an “impartial honest broker” in restoring the power-sharing arrangements and upholding NI institutions.