Former Congress leader Kirti Azad today joined the Trinamool Congress (TMC) in the presence of party supremo and West Bengal Chief Minister Mamata Banerjee in the national capital.<br />''<br />''After joining TMC, Mr. Azad said, he will work for the development of the nation under the leadership of Mamta Banerjee. Azad is a three-time Lok Sabha Member from Bihar's Darbhanga seat. <br />''<br />''<br />