With the world's largest electorate - almost 900 million - the elections in India is being held in seven phases through May 19, the counting will be held on May 23, and the results are expected to be announced the same day.
Rajnath, meanwhile, asked the electorate to vote as every count matters in the electoral process.
In Delhi, voting will be held in all seven seats. He alleged that the phases of elections are set to help PM Modi.
As phase six of the Lok Sabha election 2019 wrapped up on Sunday, leading campaigners of all political parties will be looking forward to the final week of campaigning before polling concludes in the massive seven-phase elections on 19 May.
Opposition parties accuse Modi of digressing from the main issues affecting almost 70% of population living in villages and small towns. The opposition is challenging him over India's 6.1% unemployment rate - the highest in decades - and the economic difficulties of farmers hurt by low crop prices that led many to take their own lives.
Saying it has been a good fight against Modi's Bharatiya Janata Party, Gandhi told reporters, "Prime Minister Narendra Modi used hatred, we used love".
Mr Gandhi's praise of BSP chief Mayawati was an indication that the Congress had made up its mind to keep all options open, party sources said.
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His comments had given fodder to BJP leaders including Prime Minister Narendra Modi, who wasted no time in launching a tirade against the Congress ahead of the crucial Lok Sabha polls in Punjab. Nationally he is the main rival to sitting prime minister Modi. People at the end of it are looking at their bottomline. "I think 1984 was a needless tragedy that caused tremendous pain", Rahul said in a Facebook post on Friday asserting that "justice has to be done" and the people responsible for 1984 tragedy have to be punished. People now know that Mamata is going and the BJP is coming and the politics in the state would change.
"Regional parties will play a bigger role compared to the previous 5 years or even 15 years", said K.C. Suri, a political science professor at the University of Hyderabad.
But the two most powerful women politicians in the country are blocking Naidu's attempts to emerge as a "strong force" in national politics.
Priyanka Gandhi also hit out at Modi. He claimed there was no violation of the Model Code of Conduct by him during his speech and his criticism was confined to the policies and programmes and work of the Modi government.
Later in the day, Modi launched a sharp attack on Rahul Gandhi in Khandwa, saying dynasty can take him to the top position of a party, but it "doesn't bring vision and wisdom".
The internet has also been a key arena in the election, with all parties, particularly the BJP, devoting major resources to social media - including through fake news, experts say.