Story highlights Brazilian President Dilma Rousseff cancels a scheduled trip to Washington

The Brazilian Democratic Movement Party says it's pulling out of the coalition government

The move could pave the way for Rousseff's impeachment

(CNN) In a deepening political crisis that shows no sign of stopping, things just got a lot tougher for embattled Brazilian President Dilma Rousseff.

As the threat of impeachment looms for Rousseff, Brazil's largest political party announced Tuesday that it's pulling out of her coalition government.

It's unclear whether Vice President Michel Temer, the party's president, will resign.

But no matter what happens next, the Brazilian Democratic Movement Party's decision is bad news for Rousseff.

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