Well then the symbols of Mughal opression in India the Taj Mahal and Lal Qilla are not al all national monuments. Infact The India gate was built by the Britshers in the memory of WW1 soldiers fighting against Germany. Even the Rashtrapati Bhavan is the residence of the Vice Roy of England in India, Lastly the Parliament of India is the indeed the Constituent Assembly built by the Britishers.
So by that logic all the above mentioned are no way National Monuments.
Ram Setu is History of India same as Lord Ram was a historical chacaracter. Every single item in Ramayana is tracable historically and geologically. Infact the same story or Ram is also told in South East Asia cannot be out of pure imagination.
Tommorow these congresees will say the Mughals never invaded India and Taimur Lung and Nadir Shah Durrani as well as Ahmed Shah Abdali were innocent tourists to India