The Congress today charged the BJP-led opposition with adopting obstructive tactics to stall the proceedings of Parliament.Talking to reporters in New Delhi, Party spokesperson, Mrs Jayanti Natarajan said it was unfortunate and deeply regrettable. She said during every session, it was the pattern followed by opposition by indulging in slogan shouting and obstructing the functioning of Parliament. She called upon the opposition parties to come forward and discuss the issues in Parliament. Asked to comment on the opposition demand for Joint Parliamentary Committee, Mrs Natarajan said her party has not yet taken any view in this regard.