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That's right.
Trump Jr. was born (1977) to a foreign national mother. He inherited his foreign mother's foreign citizenship (Czech) by birthright. [1][2]
He was born a dual citizen.
Ivana Trump naturalized in 1988 [3][4]
These days, (D)'s can get away with putting a usurper in the oval office (although, the (R)'s were the first to do it)...the (R)'s best not nominate someone who isn't a natural Born Citizen...because there is a large percentage of informed, principled constitutionalists/originalists that would not vote for him.
That, and just as a general issue, many in this country do not like family dynasties in the Presidency.
DT Jr is not a dual citizen. My parents were both foreign nationals when I was born. I am not a dual citizen. I am an American citizen by birth and I have no other citizenship and no other passport. This whole thing was settled in 2008 with BHO, so the precedent has been set. Anyone who believes DT Jr is not eligible to be POTUS is living in an alternate universe. If this was to be challenged, it would have been done so in 2008.