Police officers stand guard outside the Constitutional Court amid strengthened security due to President Yoon Suk Yeol's impeachment trial, Seoul, Dec. 18. Yonhap

The Constitutional Court said Wednesday it has ordered President Yoon Suk Yeol to submit the martial law decree he issued on Dec. 3, as well as the minutes of two Cabinet meetings held before and after martial law was declared.

Lee Jin, a court spokesperson, told reporters the order was sent electronically Tuesday as the court gathers evidence for his impeachment trial. Yoon was asked to also submit his plans for defending himself and a list of evidence.

The deadline for submission is next Tuesday.

Rep. Jung Chung-rai of the main opposition Democratic Party of Korea, the plaintiff in the impeachment trial as chair of the National Assembly's legislation committee, was separately ordered to submit plans to support parliament's case and a list of evidence.

The Cabinet meetings in question have been a source of controversy as they allegedly skipped due procedures. The interior ministry earlier said minutes of the meetings did not exist.

Whether the court order will be delivered to Yoon remains uncertain.

The court's earlier attempts to deliver papers related to the impeachment trial failed after either the presidential office or the Presidential Security Service was marked absent or refused to receive the mail.

Lee said the court's hearings will be open to the public and the press, though they will not be broadcast live in order to "prevent disturbances and maintain order in court."

Previous impeachment trials involving former Presidents Roh Moo-hyun and Park Geun-hye were also not broadcast live, except for the sentencing hearings. (Yonhap)