The Aam Aadmi Party on Friday said any alliance with the Congress will be "very difficult" after its war of words with the grand old party over the contentious Delhi ordinance issue, at an opposition unity meeting in Bihar.

At the opposition meet in Patna, many parties urged the Congress to publicly denounce the "black ordinance", but the grand old party refused to do so which raises suspicions about its "real intentions", the Aam Aadmi Party (AAP) said in a statement soon after the meeting.