"The Brexit vote gave us a very clear message that we couldn't allow free movement (of people) to continue as it had," interior minister Theresa May said of last week's stunning decision to leave the European Union.
"It's important we get the right deal about controling free movement, but it's also about ensuring that we get the best deal possible on the trade of goods and services," May, who campaigned to stay in the bloc, told ITV political show "Peston on Sunday".
May said she would seek to "guarantee" that EU nationals already in Britain would be protected by any change in the immigration law, and said there was "no timescale" for leaving the union.
"This is not about the UK retreating, this is about the UK going centre stage in the world," she added.
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May is polling around 30 points higher than closest challenger Michael Gove among Conservative Party members, who will decide Cameron's successor, according to an ICM survey published in the Sun today.
However, she once again ruled out holding another general election before 2020.
Former education minister Michael Gove was expected to be her stiffest opponent, but appears to have alienated MPs over his last-minute withdrawal of support for close referendum ally Boris Johnson in order to launch his own bid.
"I love my country, I could not recommend that Boris be prime minister," he told BBC's Andrew Marr show today, when faced with accusations that he had knifed his friend in the back. "He was not the man and this was not the time." he said of Johnson, who decided to pull his bid following Gove's defection.