India, Nov. 15 -- US Labour Department Inspector General Anthony D'Esposito has warned companies against treating temporary work visas as a business model, signalling further suspensions and intensified investigations into alleged immigration fraud as the Trump administration steps up scrutiny of foreign worker hiring.

"The visa system and these visas that are in place are all temporary. They are not a method of doing business. You're only supposed to use, for example, an H1B visa if you cannot find a willing and able American to do the same job." D'Esposito said in an interview to Fox News.

"Nobody can tell me that we don't have the best and brightest here in the United States of America," he added, defending the administration's empha...