He said in his speech today that the question was confusing.
He seemed to think the questioner was accusing him of not wanting the best foreign students to stay once the have graduated.
He wants top students to stay rather than send everything back to their native countries.
He also reemphasized he did not one anyone to stay at the expense of any American workers.
Not much difference between foreign students and H1-Bs. The foreign students just get to come here earlier and take away a slot in school from an American even before they take away their job.