Nothing is really publicly known about bam’s origins. His background has been sanitized and sealed up. Trump’s statement is foolish insofar that it makes as much sense to claim O is foreign and PRETENDED to be a US citizen to further his political career. Both claims are equally valid without proof one way or the other.
They don’t have equal consequences.
In one case, it just shows Obama to be a deceptive person who games the system. That’s morally reprehensible (except to a leftist), but not a Constitutional crisis by any means.
An ineligible person serving as president for 6 years - that’s a Constitutional Crisis situation.