citizenship test in 2007. It has been argued that the test may appear reasonable at face value, but is really intended to appeal to those opposing immigration from particular geographic regions. Canada During the 2015 Canadian federal election, the Conservative party led by incumbent Prime Minister Stephen Harper was accused of communicating "code" words in a debate to appeal to his party's base supporters. Midway through the election campaign the Conservative Party hired Australian political strategist Lynton Crosby as a political adviser when they fell to third place in the polls behind the Liberal Party and the New Democratic Party. During a televised election debate Stephen Harper, while discussing the government's controversial decision to remove certain immigrants and refugee claimants from accessing Canada's health care system made reference to "Old Stock Canadians" as being in support of the government's position. Opposition leaders, including former Quebec Liberal MP Marlene Jennings, called his words racist and divisive, as they are used to exclude Canadians of colour. United Kingdom Lynton Crosby, who had previously managed John Howard's four election campaigns in Australia, worked as a Conservative Party adviser during the 2005 UK general election, and the term was introduced to British political discussion at this time. In what Goodin calls "the classic case" of dog-whistling, Crosby created a campaign for the Conservatives with the slogan "Are you thinking what we're thinking?": a series of posters, billboards, TV commercials and direct mail pieces with messages like "It's not racist to impose limits on immigration" and "how would you feel if a bloke on early release attacked your daughter?" focused on controversial issues like insanitary hospitals, land grabs by squatters and restraints on police behaviour. Labour MP Diane Abbott described the 2013 "Go Home" vans advertising campaign by the British Home Office as an example of dog-whistle politics. In April 2016, Mayor of London and Conservative MP Boris Johnson was accused of "dog whistle racism" by Shadow Chancellor of the Exchequer and Labour MP John McDonnell when Johnson suggested U.S. President Barack Obama held a grudge against the United Kingdom due to his "ancestral dislike of the British Empire" as a result of his "part-Kenyan" heritage, after Obama expressed his support for the UK to vote to remain in the European Union ahead of the UK's referendum on EU membership. In the 2016 London Mayoral Election, Conservative candidate Zac Goldsmith was accused of running a