On Sunday, Modi also came under attack from Yadav, who's also the incumbent chief minister of Uttar Pradesh and seeking re-election with Congress's support in the ongoing elections. "He can peep into bathrooms in his free time".
The duo was present to launch the Congress-SP alliance's common minimum programme.
Talking about Modi's warning in Uttarakhand on Saturday that he had everyone's horoscopes, Gandhi said that it might be the Prime Minister's favourite pastime and that he should continue to google.
The first of the five-phase assembly polls in India's largest state began at 8 a.m. local time and will continue till 5 p.m.
In his almost 45-minute address, Modi, who represents Varanasi in Lok Sabha, attacked the Akhilesh-led government on several fronts, including law and order, even as he made promises of "rectifying the wrongs" committed by the state government.
"Only BJP can do holistic development of the state and will win the polls with a big mandate", he said at a press conference. Narendra Modi's demonetization of high-denomination bank notes and surgical strikes across the border in Pakistan will be put to test in Uttar Pradesh assembly elections. "There are 40,000 complaints registered under the Arms Act", he said. Mr Gandhi, along with Samajwadi Party chief Akhilesh Yadav, was addressing a joint presser in Lucknow.
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Rahul said Modi had done nothing for Uttar Pradesh in the last two years.
"The government will be judged on the popularity or lack of popularity of its demonetisation policy in India's most populous state", said Ashok Malik, a fellow with think-tank Observer Research Foundation.
Meanwhile, clearing the air about the differences between the alliance over a few seats, Rahul said, "On 99 per cent of 403 seats there is no problem".
Mr Akhilesh Yadav also joined the Congress vice- president in attacking the Prime Minister.
Without naming, Modi on Friday had said that the maximum number of jokes that one will find online were made on the ministers of the grand old party.
Polling in these constituencies will be held on February 11.