Doesn’t an employer have to prove that international students are not taking jobs from a qualified American?
No. American employers are not required to document that a citizen of another country did not take a job from a qualified American if that person is working under a F-1, J-1 or H-1B visa. Employers must document that they did not turn down a qualified American applicant for the position only when they wish to hire foreign citizens on a permanent basis and sponsor them for a permanent resident status (green card).