The PMDB is expected to break from the Rousseff government today in Brazil. Whether or not President Rousseff is impeached, one key issue to watch moving forward will be PMDB unity, which would be a historical first. Vice President Michel Temer appears to be making a play for the presidency, but in spite of his high rank, he's a weak person to hold the coalition together. Speaker of the House Eduardo Cunha broke away from the government several months ago, creating a rift in the party. Several PMDB politicians in Congress will feel pressure to protect Rousseff on impeachment. Some members of Congress will likely sit on the sidelines and wait to join the winning side when it becomes apparent. And, of course, the party has a large number of its own corruption scandals that could further test its cohesiveness as Lava Jato investigations progress.