The House Committee on Appropriations conducted an inquiry in aid of legislation into alleged irregular and anomalous disbursements of the Countrywide Development Fund (CDF) and Congressional Initiative Allocation (CIA) of Congressmen as exposed by X, a Division Chief of the Department of Budget and Management (DBM). Implicated in the questionable disbursements are high officials of the Palace. The House Committee summoned X and the DBM Secretary to appear and testify. X refused to appear, while the Secretary appeared but refused to testify invoking executive privilege. May X be compelled to appear and testify? If yes, what sanction may be imposed on him? (2%) Is the Budget Secretary shielded by executive privilege from responding to the inquiries of the House Committee? Explain briefly. If the answer is no, is there any sanction that may be imposed upon him? (3%)