The House managers made their case directly to the senators who will act as jurors in the impeachment trial. When that happens, everyone has to leave the chamber, including the House managers and the President's defense team, the source said. The Senate goes into closed session during the impeachment trial because senators are jurors and are not allowed to speak during the trial. The seven House impeachment managers, led by House Intelligence Chairman Adam Schiff, are returning to Washington Sunday to prepare for the trial, according to Democratic aides. The House will then have the chance to counter to the President's trial brief by 12 p.m., ET on Tuesday.

Source: CNN January 18, 2020 22:35 UTC