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JERUSALEM, ISRAEL - NOVEMBER 11: Mayor of London, Boris Johnson is seen during a tour of Jerusalem's Old City , on November 11, 2015 in Jerusalem, Israel. Johnson arrived in Israel on Monday in a bid to boost London's economic ties with the region. The Mayor began his visit in Tel Aviv before travelling to Jerusalem and then onto Palestine's city of Ramallah. (Photo by Lior Mizrahi/Getty Images)

JERUSALEM, ISRAEL - NOVEMBER 11:  Mayor of London, Boris Johnson  is seen during a tour of Jerusalem's Old City , on November 11, 2015 in Jerusalem, Israel. Johnson arrived in Israel on Monday in a bid to boost London's economic ties with the region. The Mayor began his visit in Tel Aviv before travelling to Jerusalem and then onto Palestine's city of Ramallah.  (Photo by Lior Mizrahi/Getty Images)