Similarly, Donald Trump posted on his website about immigration, "We will not be taken advantage of anymore".
The group says on their website that immigration has become a "social engineering experiment that is conducted on Canada's mainstream population in order to make it a minority".
Only two major candidates, Herman Cain and Rep. Ron Paul (Texas), devote a full section on their campaign websites to immigration issues.
Her website lists her immigration proposals, which don't say anything about an unlimited increase in immigration.
In a nod to Canada, whose immigration website collapsed after the election of Donald Trump, Khan said: "London is open, and our website is not going to crash".
New Zealand's immigration website has lists of high-priority job categories that will get your immigration application fast-tracked.
On election day in 2004, a record-setting 179,000 people visited Canada's official immigration website, the majority of them Americans.
Canada's main immigration website appeared to suffer repeated outages on Tuesday night as Trump took the lead in several major states and his prospects for winning the US presidency turned markedly higher.
As a Trump victory looked increasingly likely on Tuesday night, reports emerged that Canada's citizenship and immigration website was down, with users around the world receiving an internal message error when they tried to access the site.
But they actually started browsing the Canadian immigration website the night they heard Bush propose a constitutional amendment to ban same-sex marriage during his State of the Union address in 2005.
