You seem to have been given some poor information
OPT visa holders are already eligible to become H-1Bs.THe H-1B is a dual visa - guest workers who are eligible to apply for green card.
While H-1Bvisa has time limits, there is no enforcement.
Visa overstay among Indians, the main holders of H-1B’s has been the fastest growing source of illegal aliens in the US for several years.
The hire americans first requirement is not limited to H-1B’s
“Requirement to hire American workers first. Too many visas, like the H-1B, have no such requirement. “
That is NOT what Trump is proposing. Trump is proposing a legalization for foreign students after they graduate with no expiration and with no requirement that Americans First be hired.
What Trump wants to do is just as bad as expanding H1Bs.
What part of that are you missing?