The Congress attacked the Bharatiya Janata Party's post-poll alliance with Jharkhand Mukti Morcha on Saturday dubbing it as "the high point of unprincipled and unethical politics".
"The alliance between the JMM and the BJP is the high point of unprincipled and unethical politics. Neither had they a pre-poll alliance nor do they have a moral claim to form government," party spokesman Manish Tewari said.
Accusing JMM of winning their assembly seats with the support of the Maoists, Tewari wondered how the BJP could take a tough line on tackling Maoist violence.
"It (BJP) needs to introspect as to how a party, which has come to power on the support of Maoists and Naxals, would be able to take a tough line on the question of tackling Naxal violence," the spokesman said.
Tewari said that till Friday, BJP leader Arun Jaitley and others were "crying hoarse" about Shibu Soren's "criminal" past, but "today they have no compunction about aligning with a man who is being tried in three murder cases, including one which is coming up for hearing as early as January 5, 2010".
All India Congress Committee general secretary Janardan Dwivedi also charged the BJP with double standards.
"They (BJP) have a different yardstick when a party is with them and another when it is not with them," he said.
