"Our forefathers gave their lifeblood for our freedom," she said in a tweet, recalling her great-grandfather Jawaharlal Nehru's speech on the midnight of August 14-15, 1947, when India attained Independence.
"In that hard-fought freedom is enshrined the right to equality, and the right to freedom of religion", she said.
Priyanka Gandhi, who is also in-charge of eastern Uttar Pradesh, said, "We will fight the government agenda to systematically destroy our Constitution and undo the fundamental premise on which our country was built with all our might."
The remarks of the Congress leader came a day after the Lok Sabha passed the CAB that seeks to give Indian nationality to non-Muslim refugees from Pakistan, Bangladesh and Afghanistan. The Bill was vehemently opposed by major opposition parties which described it as "against Muslim community."
However, the government maintained that the Bill does not affect the community residing in the country. The Bill was tabled for discussion in the Lok Sabha on Monday by Union Home Minister Amit Shah.
The Congress leader in an open letter to the people of Uttar Pradesh alleged that the government was trying to "bring the Constitution of the RSS" and accused Union Home Minister Amit Shah of presenting wrong history in the Lok Sabha.
( With inputs from IANS )