A day after he skipped a luncheon meeting of opposition parties called by Congress President Sonia Gandhi, Mr Kumar had met PM Modi on May 27 amid the buzz about growing bonhomie between the two leaders.
PM Modi had hosted a luncheon in honour of his visiting counterpart from Mauritius Pravind Jugnauth, which was also attended by Mr Kumar, triggering political speculation about their growing proximity.
Mr Ahmad lauded the JD(U)-RJD-Congress alliance in Bihar and gave its example to stop the victory march of BJP.
"In UP, if Mayawati ji had joined us in the alliance with Samajwadi party, the result would have been different.
"We should have an alliance there like that in Bihar," the Congress leader said.
"In the polling of five states, BJP were defeated in three. Of course, they had an astounding victory in UP and Uttarakhand. Anti-Modi parties must unite.
"We have been successful in stopping the BJP from implementing anti-people laws like amending the Land Acquisition Bill only because of a united opposition," he added.
Mr Ahmad also criticised the government for "completely failing on national security front", both internally and externally.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.