New Delhi, July 24 - Microsoft founder Bill Gates Friday said it would be a 'big mistake' if the US imposes curbs on the entry of skilled workers from abroad, putting his weight behind 'smart people' from countries like India who want to work overseas.

'I can't make any predictions. Immigration policy could get more difficult. Microsoft as a company is very vocal. It would be a big mistake,' Gates, here for overseeing the philanthropic activities of his foundation, said in an interaction with India Inc.

'The US Congress is very tough on immigration. But why not make an exception for smart people?' said Gates while addressing an interactive session organised by the National Association of Software and Service Companies (Nasscom).