The sixth corruption charge Tuesday involves former President Win Myint, plus a new witness is now allowed to testify, which delayed the trial verdict.
More than a dozen police trucks with four water cannons were deployed near Sule Pagoda in the capital, where many of pro-democracy protests have been taking place.
The United States "opposes" attempts by Myanmar's military to overturn the election, and the White House said Sunday it "will take action" if the Myanmar army doesn't reverse its course.
After winning a historic election, the Nobel winner needs to bring peace to all of Myanmar.
The opposition appears on course for a landslide in the first free elections in 25 years.
Activist's National League for Democracy party is expected to win largest share of votes.
Ahead of Myanmar's historic elections, a new report finds evidence of ongoing genocide against the Muslim minority group.
Myanmar is holding its historic elections in a matter of weeks.