' Ever Closer Union ' has been at the fore since 1957 in EU treaty's.
The EU is like most governments split into 'camps'. The biggest party is the EPP (European Peoples Party).
At a summit in Madrid the likes of Junker, Merkle, Tusk who belong to this 'grouping' adopted a resolution underlying their DESIRE FOR A MORE INTEGRATED UNION it states , 'INTEGRATION IS THE FOUNDATIONAL PHYLOSOPHY BEHIND THE EU, WE MUST UNITE CITIZENS , INTEGRATE ECONOMIES, REMOVE BORDERS AND JOIN FORCES IN PURSUIT OF COMMON EUROPEAN WELL BEING'.
Many countries have parties who have MEP' in theEPP section of the European Parliament. The Conservatives sat in this grouping until 2009 , I believe it remains 'the home' of the Labour Party but I could be wrong.