Morning top 5: Pressure on Cameron, Ireland bids for glory and Biden returns home

The top stories this Sunday morning...

The EU's founding members have demanded the UK urgently invoke Article 50 of the Lisbon Treaty to start the process of leaving the union.

Foreign ministers from the six original members attended a hastily arranged meeting in Berlin yesterday.

David Cameron, who announced his resignation on Friday, has said he will leave it to his successor to start the two-year negotiation process.

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Excitement is building ahead of Ireland's Euro 2016 game against France this afternoon.

Thousands of Irish fans have travelled to Lyons for the knockout match, which represents the furthest Ireland has ever reached in the competition. 

A fanzone is being erected in Dublin city centre at Smithfield, while the GAA will show the game on the big screens in Croke Park this afternoon.

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Jeremy Corbyn has sacked his shadow foreign secretary, Hilary Benn, following reports of a coup to oust the British Labour leader.

More than six months of simmering tension between the pair have boiled over, with Mr Corbyn dramatically sacking the Leeds MP from his shadow cabinet in the early hours of the morning.

It came after the Observer newspaper reported that the shadow foreign secretary called fellow Labour MPs over the weekend and said he would ask the party leader to stand down if there was significant support for a move against the leader.

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US Vice-President Joe Biden will attend a lunch at Farmleigh House in Dublin today before returning to the US.

Mr Biden's six-day trip to Ireland saw his visit his ancestral homes in Meath and Louth.

He also delivered addresses at several events in Dublin, including one at Dublin Castle where he took aim at presumptive Republican presidential nominee Donald Trump.

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In the US, a four-year-old boy has been shot dead by his six-year-old brother.

The older boy had been playing with his mother's gun at their home in Essex County, New Jersey.

The boys' 22-year-old mother has been arrested and charged with endangering the welfare of a child, as well as a weapons violation.