Many countries will give a person citizenship if their grandparents were born in that country. They can’t be president?
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Of course they can if they were born to an American parent.
Trump’s mother was Scottish and was naturalized several years before Donald’s birth. Did Great Britain ever remove her British citizenship? Probably not so she had dual nationality once naturalized — American and British. Does that effect Donald’s eligibility for the presidency? Hell no it doesn’t, not in the least.
When Trump’s mother married his father she took her husband’s US citizenship. Was like that back in the day. And furthermore, when a female US citizens became the wives of foreigners they lost their US citizenships upon marriage.
No....you have to renounce your other citizenship when you become a naturalized American citizen !