Ugandan MPs who are backing the lifting of the presidential age limit say they will not be intimidated by opponents to the change.
The upper age limit for how old someone can be to run for president is currently 75.
The change would allow President Yoweri Museveni, in power for 31 years, to be a candidate in 2021.
The MPs, from the governing NRM, appeared in the grounds of parliament wearing T-shirts with 75+ written on the back.
The T-shirts were made by the Kick Age Limit Out of the Constitution youth group which is mobilising for the cause.
At a press conference, some of the MPs said opposition supporters have threatened them.
One said he is ready to be a martyr.
Another said the NRM cannot be intimidated because they have the numbers in parliament.
Earlier this week, MPs agreed to support a motion to begin the process of changing the rules. It is not clear when that will happen.