Parliament spokeswoman Nancy Pelosi announced that preparations for impeachment will begin this week.

The Washington Post reports that Pelosi said Wednesday there would be a vote on a resolution appointing impeachment officials and forwarding the impeachment articles to the Senate.

In this way, the trial of President Trump could begin this week, the Washington Post reports.

However, it is still open whether witnesses are on trial and who should testify as senators in the chamber controlled by the majority leader Mitch McConnell maneuvered behind the scenes, reports the Washington Post.

Senate Majority Whip John Thune is unsure if the trial will start this week, the Washington Post reports. He expects the Senate to address preliminary issues this week, but will not begin the process until after Martin Luther King Jr.’s holiday weekend.

“I guess what’s going to happen, we’re going to curse that and all that … and then probably start the process next week,” Thune told the Washington Post. “I am assuming that we will keep the vacation and be back the day after tomorrow.”

The Washington Post reports that Trump is expected to provide a State of the Union address in the House of Representatives chamber on February 4, and Thune said it is unclear whether the process will be completed by then.