Demonstrations today blocked access to Brazil's biggest port in Santos, on the Sao Paulo state coast. It wasn't clear how many demonstrators were involved.
Protests were also seen in at least four other states, with more expected as the day goes on.
In Brasilia, Rousseff's office says she'll meet in the early afternoon with members of the Free Fare Movement. That's the group that ignited the original protests in Sao Paulo against a hike in public transport fares.
Despite having the fare hike reversed in several cities, the group says it will continue to fight for its objective of free transportation for all.