Philippine senators have set themselves as an impeachment court for the trial of Vice President Sara Duterte over corruption and other criminal allegations but they voted to send the raft of complaints back to the House of Representatives due to legal questions.

Prospects for a Senate trial of Philippine Vice President Sara Duterte were thrown into doubt late Tuesday, after the Senate voted to return the articles of impeachment to the House to ensure they aren’t in breach of the constitution.

Philippine senators on Tuesday voted to send an impeachment case against Vice President Sara Duterte back to the lower house for clarification, just hours after convening a trial that could see her banned from politics for life.