COA Auditor's Admission Exposes the Hollow Core of Duterte Impeachment

Commission on Audit auditor Xylene Mae del Campo testified on August 12, 2026 that she harbored concerns over the handling and disbursement of Vice President Sara Duterte's confidential funds. One day earlier, she had admitted under examination that she never asked whether acknowledgment receipt payees Anne Ongpauco and Heart Santiago were related to the Presiding Officer. Fifteen days into an impeachment trial that will determine whether a sitting Vice President misused public money, the prosecution's own witness conceded she failed to pursue a basic investigative question.

This is not an accountability process. It is a procedural performance masquerading as one.

The distinction matters because the prosecution has been granted extraordinary institutional authority—subpoena power, Senate floor time, national attention—yet continues to produce testimony that documents irregularities without establishing the evidentiary chain required for impeachment. The COA auditor's concerns about confidential funds disbursement are legitimate starting points for inquiry. But concerns are not conclusions, and irregularities are not proof of misuse. When the auditor responsible for examining these disbursements admits she never asked whether payees had conflicts of interest with the tribunal itself, she reveals a failure of investigative diligence that the prosecution cannot paper over with procedural volume.

The competing frame advanced by Sara Duterte's legal team—that this has become "mutual legal combat" rather than unidirectional scrutiny—deserves direct engagement. On August 17, 2026, the Vice President filed a second perjury complaint against her accuser Ramil Madriaga. This strategy transforms an impeachment proceeding into reciprocal litigation, diluting the asymmetry that should exist between state power examining an officeholder and that officeholder's defense. Critics of this framing would argue that Duterte's perjury complaints are themselves evidence of obstruction, an attempt to intimidate witnesses and distract from substantive charges.

That criticism would carry weight if the prosecution had presented substantive charges backed by verified documentary evidence. It has not. Sixteen days into trial, the COA testimony addresses handling and disbursement procedures for confidential funds—procedural irregularities that may or may not indicate misuse. The auditor raised concerns. She did not present ledgers showing funds diverted to personal accounts. She did not produce bank records demonstrating unexplained wealth. She could not even confirm whether she had investigated potential conflicts of interest among payees. The prosecution is asking the Senate to remove a Vice President from office based on concerns and procedural gaps, not on affirmative proof of corruption.

This is where procedural governance betrays its fundamental inadequacy. The impeachment trial follows formal processes with meticulous attention to parliamentary order, witness sequencing, and evidentiary submission protocols. But these processes exist to serve a substantive outcome: determining whether Sara Duterte violated public trust through misuse of confidential funds. When the process becomes the product—when "concerns" substitute for proof and procedural volume substitutes for evidentiary weight—the trial fails its constitutional purpose regardless of how correctly it follows Roberts' Rules.

The prosecution has completed evidence presentation for only one of four articles of impeachment: grave threats.¹ The most serious charges—confidential funds misuse and unexplained wealth—remain incompletely documented despite court-granted subpoenas. This pattern suggests either profound strategic miscalculation or an absence of documentary evidence sufficient to sustain the charges. Neither explanation supports removing a sitting Vice President.

I have maintained since the trial's opening that the prosecution has failed to present substantial verified evidence warranting impeachment. Nothing in the COA auditor's testimony changes that assessment. Del Campo's admission that she never pursued basic conflict-of-interest questions underscores the investigative gaps underlying this proceeding. If the prosecution possessed definitive evidence of funds misuse, they would not be relying on auditor testimony about procedural concerns and missing documentation. They would be presenting the documentation itself.

The defense strategy of filing perjury complaints is procedurally aggressive and optically problematic. It creates a legitimate appearance of witness intimidation. But the prosecution cannot complain about obstruction while simultaneously failing to present the affirmative case for which they bear the burden. If Madriaga's testimony is truthful and material, the prosecution should welcome cross-examination that exposes perjury complaints as meritless harassment. If they fear the perjury suits will chill witness cooperation, they should move for expedited documentary production rather than relying on testimony that, as del Campo demonstrated, can be dismantled by basic questions about investigative thoroughness.

The Senate will likely proceed through all four articles regardless of evidentiary adequacy. Impeachment is a political process, and political processes respond to political incentives rather than evidentiary standards. But when this trial concludes—whether in acquittal, conviction, or the procedural limbo that often accompanies Filipino impeachments—it will have established a precedent for what counts as "substantial evidence" in removing a constitutional officer. That precedent will outlast Sara Duterte's political career and constrain or enable future accountability proceedings for decades.

The prosecution has approximately three weeks to produce the documentary evidence that would justify the institutional disruption of impeachment. If they cannot produce bank records, fund flow analyses, or testimony from individuals with direct knowledge of fund diversion—not concerns about procedures, but evidence of misuse—they should acknowledge that the case has not been made. Continuing a trial that substitutes procedural volume for evidentiary weight damages the Senate's credibility as an accountability forum and immunizes future officeholders who learn that impeachment proceedings can be survived through the prosecution's own inadequacy.