Delhi Chief Minister Arvind Kejriwal on Tuesday said he believes in freedom of expression, and hence a protester should be allowed to protest.Reacting to slogans against him at Jantar Mantar on Tuesday, instead of intervening, Kejriwal said the protester should be allowed to protest.The man raised a slogan "Aarakshan virodhi Kejriwal", when the Aam Aadmi Party leader was speaking at a protest march."Let him protest. We believe in freedom of expression. When did I say I am against reservation? I have always supported it," said Kejriwal.Kejriwal was addressing people at Jantar Mantar after a protest march condemning the "institutional killing" of 26-year-old Rohith Vemula, a research scholar at the University of Hyderabad. Hundreds of students and faculty members of various universities took part in the march from Ambedkar Bhawan to Jantar Mantar.