Addressing a party rally here, Shah accused the Congress of behaving like as it did during the Emergency.
He lashed out at the party for its "role" in supporting a statewide bandh today on the state's row with Goa on sharing Mahadayi river water.
Shah's rally as part of the "Parivarthana Yatra" by the state BJP came amid the bandh called by pro-Kannada outfits seeking Prime Minister Narendra Modi's intervention on the Mahadayi water sharing issue.
"Congress is even now behaving like it did during the emergency by deploying police to hold off supporters and by organising Mahadayi bandhs matching my and Prime Minister Narendra Modiji's Parivartana Yatra address," he said.
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Shah said despite "desperate attempt" to disrupt the rally here by organising the bandh, "we have managed to hold it and been successful at it."
The BJP chief said despite these obstructionist tactics, Congress party and Siddaramaiah would not be able to stop BJP from forming the government because people of Karnataka have decided on a change.
BJP sources claimed that Shah's rally was attended by close to 50,000 people, ignoring the bandh call.
"Buses have been stopped, bandh has been called, efforts are on to stop Modi's rally on February 4, but I have confidence in the people of this great Karnataka," he said.
The number of people who will attend Modi's rally on February 4 will makeit clear BJP will win the election that will happen in April-May, Shah said.
He also accused the Siddaramaiah government of indulging in "appeasement politics" for the sake of votes.
Shah said within four years, more than 20activists of BJP and RSS had been killed.
He asked as to why cases against Social Democratic Party of India, political arm of the Popular Front of India, which the party is holding responsible for the killings, were withdrawn.
"I want to ask Siddaramaiah whether he is certifying SDPI. Why were the cases withdrawn?," he asked.
The BJP chief said the Congress opposed the triple talaq bill due to "politics of appeasement."
But the BJP and the Prime Minister are committed to passing this bill to do justice to Muslim sisters and mothers, he said.
He also slammed the Siddaramaiah government over its decision to celebrate the birth anniversary of 18th century Mysuru ruler Tipu Sultan.
Taking on the Congress government on graft, he alleged that the Siddaramaiah government has crossed all boundaries of corruption.
"Does anyone of you here have a watch worth Rs 70 lakh on your wrist here? Your chief minister wears watches worth Rs 70 lakh," he said.
Shah was apparently referring to the controversy in 2016 over Siddaramaiah wearing a luxury watch which JDS leader H D Kumaraswamy had alleged was diamond-studded Hublot which was worth Rs 70 lakh.
Shah said more than 3,500 farmers have committed suicide in the last five years in Karnataka.
The B S Yeddyurappa-led parivartan yatra has instilled fear in the hearts of Congress workers, he claimed.
"BJP has started the parivartana yatra for not only to change the government, but also to bring change in the lives of youth and to give security to the women of Karnataka," he said.
Shah challenged Siddaramaiah to stop the BJP from forming the government in Karnataka using all his might.