EU Commission President says Europe facing a "battle for survival" against nationalism and populism

Suggests UK will not have access to single market when it leaves

Announces creation of 100,000-strong EU "youth corps" to tackle refugee crisis

Uses murder of Polish man in Essex as example of what happens if Europe "does not unite"

Jean-Claude Juncker, the European Commission president, insisted that Brexit does not mean "the disintegration of the European Union," as he warned that the UK may not be granted access to the single market in his State of the Union address on Wednesday.

The European Union is facing an 'existential threat', its most senior official warned, as major splits emerge between East and West countries in the wake of Brexit.

He pointed to the murder of a Polish man in Harlow, Essex last month as an example of what could happen if Europe does not unite.

"Europe can never accept Polish workers being harassed, beaten up or even murdered in the streets of Essex," he said, to applause in the chamber