Former prime minister Chandrashekhar will be leaving for US tomorrow for treatment at the Vincent Comprehensive Cancer Care Institute at New York. He has been ailing for quite some time and had been admitted to a private hospital here last month. A number of leaders including Vice President Bhairon Singh Shekhwat, UPA chairperson Sonia Gandhi, Prime Minister Manmohan Singh and several Union ministers have met the leader in recent days to inquire about his health.