"If we want to control immigration – and bring it down to the tens of thousands – we must take some big decisions."
Earlier this week, the UK Office for National Statistics revealed that the long-term net migration to the country in the year ending March 2015 had reached a record 330,000 people.
"When it was first enshrined, free movement meant the freedom to move to a job, not the freedom to cross borders to look for work or claim benefits.
May derided "broken European migration system" for lack of border control, adding that the influx was "simply unsustainable."
The British government has been at odds with Brussels over EU’s landmark principle of free movement.
Prime Minister David Cameron has vowed to hold a referendum on the country’s possible exit from the 28-nation bloc by the end of 2017 and offered EU reforms calling for migration curbs.
