Amazon, Google and Twitter were among the leading tech firms who slammed Donald Trump's latest immigration crackdown claiming his visa freeze would make the US less competitive. The President has banned new H-1B visas, which are used by major companies to bring over highly-skilled engineers from abroad. Around 18,000 H1-B visas were given to Google and Apple last year. Amazon said the measures 'put America's global competitiveness at risk' while ...