The MP from Bahraich, Uttar Pradesh, has long been critical of the party's leadership,
The Dalit leader said her objective was to get the Constitution implemented in letter and spirit.
She said she will launch an agitation to champion the cause of Dalits from December 23, adding that the country needs a Constitution not a temple.
She has also accused the BJP of dividing society and often the party over its Hindutva plank.
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