Clarification- "to be a citzen of the same country he is president". It is important in the United States because it is part of the constitution and an agreed upon formality among all of our founding fathers. They thought that way because they wanted a person that understood and believed in the values and freedom one has growing up in this country.
The president of Germany is the most important citizen.
No.
That would be unlikely, perhaps if he had dual citizenship. But he would have to be a citizen of the country he was president of.
important
The former president of the country.
A cheif citizen
It depends on the legislation of the country concerned.
No. The US Constitution requires the president to be a natural born citizen of the United States. It also requires a president to be at least 35 years old and 14 years a resident of this country. So not only could a British citizen not be president, but even a British citizen who gave up British citizenship and became a naturalized US citizen cannot be president.
Your an American citizen so run for president buddy
If the president was an American citizen for more that 14 years, then maybe.
A cheif citizen
Yes. America is a free country.