European Union migrant cap plan illegal, says Nick Clegg
16 December 2013 Last updated at 15:59 GMT
Nick Clegg has said an annual cap of 75,000 EU immigrants into Britain would be illegal.
The deputy prime minister said such a move would be a "disaster for the economy" and bring "tit-for-tat" actions by other member states.
Home Secretary Theresa May has refused to comment on reports that a review by her department proposed the limit.