Modi is a lifelong member of a paramilitary Hindu nationalist group called Rashtriya Swayamsevak Sangh (RSS), which has carried out assaults on the country's religious minorities. The right-wing group was created back in 1925, directly inspired by Europe's fascist movements.
With 117 million Muslims and 28 million Christians in India, there's reason to worry about what Modi will mean for religious minorities, especially because of his alleged involvement in anti-Muslim riots that led to the murder of thousands in early 2002.
According to a 2002 Human Rights Watch report, "the attacks against Muslims in Gujarat have been actively supported by state government officials/police.
The US government should continue the Visa Ban on Modi invoked in the wake for his complicity in the 2002 pogrom.