The Congress has said the assembly polls results were "unexpected" and have alleged discrepancies in the EVMs in some seats.
Tanwar, former MP from Sirsa in Haryana, had quit the Congress in 2019.
Mamata said that she raised the issue of violence in Tripura in which TMC workers were allegedly assaulted by BJP workers.
Under fire for spiralling rape cases, the Haryana Congress has found itself in the middle of another row, with a local party leader stating that 90 per cent rapes were "consensual", only to retract the comments later. Haryana Pradesh Congress Committee member and Congress Hisar district spokesman Dharambir Goyat told reporters in Hisar on Thursday night that "90 per cent of rape cases are (a case of) consensual sex between the girl and boy."
Describing it as 'Sankalp Patra', the party in its manifesto promised 33 per cent reservation to women in government jobs and private institutions in the state and free rides in Haryana roadways buses.
Giving impetus to Congress' election campaign in Haryana ahead of next month's assembly polls, Prime Minister Manmohan Singh, party chief Sonia Gandhi and general secretary Rahul Gandhi will address public rallies in various parts of the state.
The Congress, which ended up six seats short of a simple majority in the 90-member Haryana assembly, will meet Governor Jagannath Pahadia in Chandigarh on Friday to stake claim to form the government. "We are going to meet the governor shortly with letters of support from independent candidates and stake our claim," said Pradesh Congress Committee chief Phool Chand Mullana. When queried about how many independents were supporting the Congress, he said, "All of them."
Congress on Saturday downplayed the resignation of Haryana Pradesh Congress Committee president Bhajan Lal saying the party had not received any communication from him.
Congress president Sonia Gandhi has appointed Tanwar as the IYC chief with immediate effect.
Himachal has a tradition of change in government after every elections and going by the trend, this time it is the turn of the BJP which is upbeat after exit poll results.
Hooda said he accepts the decision taken by the party high command and will make all efforts to form a Congress government in the state.
Senior Congress leaders from Haryana have asked for the resignation of Chief Minister Bhupinder Singh Hooda before the assembly elections in the state slated to be held by October this year.
Congress vice-president Rahul Gandhi has said the party cannot afford the spectacle of its ministers and state presidents running away from a tough contest. Anita Katyal reports