An Taoiseach Enda Kenny says he is concerned at a propsed deal between British Prime Minister Theresa May's Conservative Party and Northern Ireland's Democratic Unionist Party (DUP).

Mr Kenny spoke by phone Sunday morning with Mrs May.

They discussed the outcome of the UK general election and Mrs May outlined the proposed supply and confidence arrangement with the DUP.

In a statement, Mr Kenny indicated "concern" that nothing should happen to put the Good Friday Agreement at risk, and the challenge that any arrangment will bring.

He also noted the absence of any nationalist voice in Westminster following the election.

Both leaders agreed the immediate concerns are efforts to establish an executive as soon as possible, with exploratory discussions with the Northern Irish parties to take place Monday.

The pair discussed the meeting between Foreign Affairs Minister Charlie Flanagan and Secretary of State for Northern Ireland James Brokenshire, also scheduled for Monday.

On Brexit, they noted negotiations were set to begin later this month, with Mr Kenny reiterating Irish concerns.

The Taoiseach said that there should be an early meeting between the Mrs May and Leo Varadkar.

Mrs May is set meet DUP leader Arlene Foster on Tuesday after Downing Street mistakenly announced an agreement with the party.

Some Conservatives, including the party's Scottish leader Ruth Davidson, are unhappy about a deal with the DUP because of the party's opposition to gay marriage and abortion.

In an apparent criticism of the move, Ms Davidson tweeted a link to a speech she made in Belfast in favour of marriage equality.

Later, the Scottish Tory leader said she had received "categoric assurances" from Mrs May over LGBTI rights.