Germany's Christmas markets and festivals have come under attack before, mainly from extreme Islamists. Abdulmohse

President-elect Donald Trump plans to launch a mass deportation operation targeting millions of immigrants living in the U.S. illegally and with temporary protections once he takes office on Jan. 20, a challenging initiative that could split apart families and affect U.S. businesses.

The man suspected of driving a car into a Christmas market in Germany is an exiled Saudi doctor who praised far-Right politicians for combating the “Islamisation” of Europe and pledged to take “revenge” for the “harassment” of female refugees.