The Indian Parliament had passed the Citizenship Amendment Act (CAA) last year, resulting in a series of protests across the country.
Pramila Jayapal had last year introduced a Congressional resolution urging India to end the restrictions on communications in Jammu and Kashmir and preserve religious freedom for all residents.
Congressman Alan Lowenthal too termed the violence a "tragic failure of moral leadership".
"We must speak out in the face of threats to human rights in India," he said.
Democratic presidential candidate and Senator Elizabeth Warren also a swipe at the violence, saying, "It's important to strengthen relationships with democratic partners like India. But we must be able to speak truthfully about our values, including religious freedom and freedom of expression, and violence against peaceful protesters is never acceptable."
Congresswoman Rashida Talib tweeted, "This week, Trump visited India but the real story should be the communal violence targeting Muslims in Delhi
right now. We cannot be silent as this tide of anti-Muslim violence continues across India."
The violence in Delhi
prominently featured in the mainstream media.
The Washington Post reported,"The riots represent a serious escalation of tensions after months of protests in response to a controversial citizenship law and growing frictions between supporters and opponents of the government of Prime Minister Narendra Modi."
"As President Trump toured India's capital, at least 11 people were killed in communal clashes that have upended a working-class neighborhood," The New York Times said.
In a tweet, US Commission for International Religious Freedom said it is alarmed by reports of "deadly mob violence targeting Muslims in New Delhi".
It urged the Modi government to rein in the mob and protect religious minorities.