India, Oct. 21 -- US secretary of state Marco Rubio has sought to allay Indian concerns over Washington's tightening of immigration rules, saying the changes are part of a global effort to overhaul the American immigration system and are not targeted at India, despite their impact on Indian students and skilled professionals.

"From your perspective here in India, it may seem targeted at India, (but) it's not," Rubio told The Indian Express in an interview. He said the Donald Trump administration was attempting to address what it viewed as years of neglect of the immigration system and alleged misuse of visa programmes.

"The biggest threat to legal immigration is illegal immigration. The biggest threat to legal immigration is mass migrat...