Most of them are citizens. She can not do that.
Germany is bound by EU court. Any such unconstitutional act will be overturned.
In a modern history, which democratic county has deported their own citizens, albeit foreign born?
Citizenship
For decades Turkish citizens in Germany were unable to become
German citizens because of the traditional German construct of "nationhood". The legal notion of citizenship was based on "blood ties" of a German parent (
jus sanguinis) – as opposed to citizenship based on country of birth and residence (
jus soli). This adhered to the political notion that Germany was not a country of immigration.
[62] For this reason, only those who were of partial Turkish origin (and had one parent who was
ethnically German) could obtain German citizenship.
In 1990 Germany's citizenship law was somewhat relaxed with the introduction of the Foreigner's Law; this gave Turkish workers the right to apply for a permanent residency permit after eight years of living in the country.
[63] In regards to people of Turkish origin born in Germany, who were also legally "foreign", they were given the right to acquire German citizenship at the age of eighteen, provided that they gave up their Turkish citizenship. Hence, they were deprived of the right to hold
dual citizenship because it would increase the
Turkish population in the country. Chancellor
Helmut Kohl officially stated this as the main reason for denying dual citizenship in 1997 when he said the following:
“ If today [1997] we give in to demands for dual citizenship, we would soon have four, five, or six million Turks in Germany, instead of three million - Chancellor
Helmut Kohl, in 1997.
[2] ”
Nonetheless, another citizenship reform law was soon introduced after Helmut Kohl finished his last term as Chancellor. The Citizenship Law of 1999, which was officially taken into effect on January 1, 2000, has facilitated the acquisition of German citizenship for people born outside of Germany, making it available to Turkish immigrants after eight years of legal residence in the country. The law’s most innovative provision granted
dual citizenship to Turkish-origin children born in Germany; however, by age twenty-three German-born Turks can no longer be dual citizens and must decide whether to keep their German citizenship or the citizenship of their parent’s country of birth.
[64]
Former Turkish citizens who have given up their citizenship can apply for the "Blue Card" (
Mavi Kart), which gives them some rights in Turkey, such as the right to live and work in Turkey, the right to possess and inherit land or the right to inherit; however, they do not have the right to vote.
https://en.wikipedia.org/wiki/Turks_in_Germany#Citizenship
And your claim is based on?
German law.