The NCP, headed by former BCCI chairman Sharad Pawar, however, added that the minister also needs to come clean over the issue.
"It a matter of proprietary, so it is both a constitutional and moral question. Sushma Swaraj owes an explanation to the country," senior NCP leader D P Tripathi said.
"However, as a responsible opposition political party, our considerate opinion is that demanding resignation of the minister at this juncture is not appropriate.
Sources said Tripathi talked to SP and RJD leader on the issues yesterday following instructions from Pawar.
This is not the first time that the party has aired conflicting views.
In an alliance in Maharashtra since 1999 to 2014, the two parties parted ways in the state during the Assembly polls held in October last year.
