The Delhi High Court will today hear Chief Minister Arvind Kejriwal s petition challenging the summonses issued to him by the Enforcement Directorate in connection with its probe into an excise policy-linked money laundering case. Kejriwal, arrested by the agency on March 21 after the high court refused to grant him interim protection from coercive action, has also challenged the constitutional validity of certain provisions of the Prevention of Money Laundering Act with respect to arrest, questioning and grant of bail.