Major US tech companies are warning employees on temporary visas not to travel outside the country, fearing they may be denied re-entry amid shifting immigration policies. Tech giants employ thousands of workers on H-1B visas, which allow highly-skilled foreign workers to temporarily live and work in the US. Warnings to H-1B Visa Holders Documents reviewed by The Washington Post show companies like Google and Amazon have advised foreign workers to avoid international travel, fearing sudden policy changes or heightened border scrutiny could leave them stranded overseas. H-1B visa denial rates