BUDAPEST - An anti-migrant billboard campaign by the Hungarian government that uses the image of US financier George Soros is "reminiscent of Europe's darkest hours," Soros' spokesman said on Tuesday.The billboards and full-page media ads that have appeared across Hungary depict a smiling Soros - a vocal critic of Prime Minister Viktor Orban's right-wing government - and the caption: "Don't let Soros have the last laugh."Some Soros billboards have been defaced with graffiti that reads "stinking Jew." Soros, 86, is a Hungarian Jew who emigrated after World War Two, made his fortune in the United States and has long supported groups promoting liberal, democratic and open-border values in eastern Europe.Michael Vachon, spokesperson for Soros, condemned the billboard campaign as "anti-European" and said it also misrepresented the financier's views on migration."Last week the Fidesz-led government launched a nationwide billboard and television advertising campaign reminiscent of Europe's darkest hours," Vachon said in an emailed statement."The Hungarian regime's xenophobia and demonization of refugees are anti-European."Orban, a rightwing nationalist, has often clashed with the European Union in the past, most recently over his clampdown on foreign-funded NGOs.