The Punjab Vigilance Bureau has summoned former Congress Punjab Chief Minister Charanjit Singh Channi for questioning in an alleged disproportionate assets case now on the 20th of April.<br />''<br />''The Congress leader has been asked to appear at the Vigilance Bureau's headquarters in Mohali today but was changed after Channi sought time.<br />''<br />''It is for the first time that Channi has been summoned for questioning in the case in which Vigilance Bureau initiated an inquiry on the 18th of November last year.<br />''<br />