UPDATE 3-Brazil's Rousseff says 'will never resign' in deepening crisis
* Rousseff says has committed no crime to shorten term
* Odebrecht says executives to seek plea bargain deals
* Rouseff govt fate rests with main coalition party (Adds Odebrecht to cooperate with prosecutors, wiretap ruling)
By Anthony Boadle
BRASILIA, March 22 (Reuters) - President Dilma Rousseff said on Tuesday she will not resign in Brazil's worst political crisis in two decades, calling an opposition move to impeach her a "coup d'etat" against democratic rule because she had committed no crime.
A corruption scandal that has reached her inner circle threatened to implicate more people after the country's largest engineering firm Odebrecht decided to cooperate with prosecutors investigating a huge political bribery scheme.
"I will never resign under any circumstances," the embattled president said in a speech to legal experts. "I have committed no crime that would warrant shortening my term."
Rousseff called on Brazil's Supreme Court to remain impartial in the crisis that has threatened to topple her government as opponents seek her impeachment in Congress.
Opposition parties have launched impeachment proceedings against Rousseff for allegedly manipulating government accounts to allow her government to spend more in the run-up to her 2014 re-election. The president could be suspended as soon as May if her supporters do not block impeachment in the lower house. Continuación...