Robert Kilroy-Silk wants an end to "mass immigration" to stop low-paid foreign workers forcing British people out of work.
Launching the immigration and asylum policies of his party, Veritas, the former chat-show host said only the rich benefited from the labourers.
But after saying it was "a matter of numbers" and not race, he conceded his party would allow in an unlimited number if there was evidence that they would help the UK prosper.
He said the party, which claims to have 158 candidates in place for the general election, wanted an "honest debate" on the issue.
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