Is he suggesting that Trump's parent were unmarried when he was born?
Assuming universal heredity, the Presidency now passes to Maryanne I of the House of Trump or Donald II of the House of Trump(disputed).
André Heinz and Christopher Heinz are fifth cousins-once removed from Trump's children, and John Kerry's step-children. Should Trump's line be forced to decline the Presidency, the Heinz brothers could feasibly claim distant kinship and declare the Presidency rightfully theirs.
/hereditary Presidency