While Donald Trump's controversial travel ban continues to be blocked by courts, there's one visa category he might successfully target - the tech industry-favoured H-1-B. The visa, designed for specialist workers, has come under fire for its use by foreign outsourcing firms within the US. But CEO of US-based cyber security firm Vectra Networks, Hitesh Sheth, warns scrapping the whole visa programme could hurt competitiveness in the US. Mr Sheth spoke with Share Radio's Peta Fuller about the issue.