http://money.cnn.com/2017/02/09/news/boris-johnson-us-citizenship/index.html
As well as his radical statements, his face and hair style is alike Donald Trump.
The fact that he dislakes Donald Trump shows the Japanese proverb "Two men who look like each other are not in a good relationship."
By the way, few people criticize his double nationality. Of course, it's because UK allows double nationality owner to take part in politics. But, in Japan, double nationality is banned from political works. And, if a candidate who changed nationality from another country will be criticized by nationalists, especially when his/her previous nationality is North/South Korea or People's Republic of China. what is more, Renho, whose nationality was(is?) Taiwan, was also blamed.