Story highlights Brazilian President Dilma Rousseff slams the impeachment process

"Today, above all, I feel injustice," she says after lawmakers voted to impeach her

She isn't on trial yet, but she could be soon

Brasilia, Brazil (CNN) A defiant Brazilian President Dilma Rousseff vowed to stand her ground Monday, a day after the country's lower house passed a motion to impeach her.

"I will fight, like I have always done in my life. ... I am sure that we will have the opportunity to defend ourselves in the Senate," she told reporters.

But Rousseff slammed the impeachment process against her as unjust, comparing it to a coup.

"Today, above all, I feel injustice," she said.

Rousseff, who became Brazil's first female President when she was elected in 2010, isn't on trial yet. But she could be soon.

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