The Brazilian congress committee will vote and this is a key step in the process of impeaching President Rousseff Dilma.
The committee that is composed of 65 members will decide whether to recommend Rousseff impeachment over allegations that she manipulated government accounts so as to manipulate an increasing deficit.
Police are ready to handle protests in Brazil’s capital, Brasilia.
A 6.5ft metal barricade has been set up in an attempt to separate the pro- and anti-government protesters.
The committee started to deliberate at around 11:00 (14:00 GMT).
The attorney general, Eduardo Cordozo, while speaking on behalf of the president during a meeting that was bad tempered said that the process was flawed.
“It is absurd to dismiss a president who has not committed crimes, nor stolen a penny. And such a process without crime or fraud, would be a coup,” he said.
The committee’s reporter, Jovair Arantes, defended the process saying that there were grounds upon which Rousseff impeachment was based on and that lawyers, the media and economists supported it.
The vote by the committee is symbolic because whichever decision that it will make, the full lower house will still vote later on this week or at the start of the next week.
The analysts have said that the results will indicate the feelings of the lower house concerning the impeachment of the president while the media suggests that the committee may lose.
Brazilian media are reporting that more than 100 members of the 513-strong lower house are still undecided.
If Ms. Rousseff manages to convince 172 members to side with her, the proceedings will be shelved.
However, if 342 vote to impeach her, the matter will proceed to the senate.
The Senate will then make a decision whether to go on with the impeachment or not. A simple majority is needed for such a decision.
A vote of two-thirds of the Senate is needed to permanently remove her from the office.
The police have reported that there is likelihood that a mass protest will be witnessed after the lower house decides.
The protesters have been warned not to bring inflated dolls or wear masks and in the process obscure their faces.
Brazilians are split along those who support the government saying the impeachment is a coup and those who say that the president is corrupt.