Merkel and Macron split over Weber presidency

German chancellor Angela Merkel, the heavyweight in Europe's centre-right political alliance, the European People's Party (EPP) and French president Emmanuel Macron, who will form a new group with liberals, are at odds over who should lead the EU executive.

Merkel gave her blessing to Bavarian MEP, Manfred Weber, the EPP's lead candidate in the European elections.

"As a member of the EPP, I will, of course, advocate for Manfred Weber," she said arriving at the summit.

Meawhile, Marcon told reporters on Tuesday: "I don't want to talk about names".

Macron then named Danish commissioner, liberal Margrethe Vestager, the EU's Brexit negotiator, French centre-right Michel Barnier, and Dutch commissioner, social democratic lead candidate Frans Timmermans as possible commission presidents - but left out Weber.

Liberal national leaders seemed to gather behind Vestager: Luxembourg's premier Xavier Bettel has said Vestager would be "perfect" for commission president.

However, it is unlikely that any decision will emerge on Tuesday or any time soon.

Premiers are expected to task the European Council president Donald Tusk to put together the priorities for the next commission by when they meet next at the end of June.

Keeping powder dry

"Nobody wants to risk political capital at this point either to exclude someone or fight for someone," said one EU official on how the meeting between leaders can play out.

"We have to discuss content first, then people," Dutch prime minister Mark Rutter said arriving to the meeting.

Weber does not have a majority in the parliament as of now, as political negotiations have only just started on building a coalition. His EPP has 177 seats in the 751-seat parliament, Socialists are in second position with 150 MEPs, liberals hold 107 seats and the greens 69.

For a strong and stable majority coalition, at least 400 seats are needed, but with the emerging power struggle between mainly the liberals and the EPP will be the initial crux.

That leaves the national leaders in a comfortable position: there is no pressure to chose or reject Weber, who several leaders see as inexperienced and representing the status quo.

Complicating matters for Weber, the liberals - who became the third biggest party in the election and are now possible kingmakers in the coalition-building - are against the lead candidate system, which would put the Bavarian Weber in pole position for the commission top job.

Other parties, such as the EPP and S&D, are upset that while the liberals have not participated in the lead candidate procedure and dismiss it, they still want to control the political process of choosing the parliament's preferred candidate for the commission presidency.

EPP officials argue that after the political campaign spearheaded by Weber, and supported by Europe's largest political family, the EPP, it will be difficult to convince EPP member parties and MEPs to ditch their candidate.

Parliament vs Council

That also creates another battle line, this time between the European Parliament and European Council, made up of national leaders, on who has the prerogative on choosing the commission president.

The parliament points to the lead candidate process, which they created in 2014, and argue that the lead candidate who builds a coalition majority should get the job.

National leaders point to the treaty that says it is the European Council's job to nominate a person on whom the parliament can vote. Leaders have repeatedly said there is 'no automaticity' in the winning lead candidate getting the commission top post.

Other big roles are also up for grabs later this year, including the head of the European Parliament and the European Central Bank, the bloc's foreign policy chief and the head of the European Council - all of which will turn the haggling into horse-trading.