LONDON - Former British prime minister John Major said on Tuesday he was concerned about a planned deal between Prime Minister Theresa May and a mainly Protestant political party in Northern Ireland to shore up May's minority government.

Former British prime ministers John Major (L) and Tony Blair share a platform for the Remain campaign event at the University of Ulster in Londonderry, Northern Ireland June 9, 2016.   [Photo/Agencies]

"I am concerned about the deal. I am wary about it. I am dubious about it," Major told BBC radio.

He said he was worried principally that the planned agreement could hurt the Northern Irish peace process in which the British government plays an impartial role.

May was meeting the leader of the Democratic Unionist Party, Arlene Foster, on Tuesday to discuss a deal for support in parliament, where May's Conservatives lost their majority in last week's election.