Republicans immediately attacked the study, calling it a flawed, partisan analysis.
The president said he didn't mind when Republicans attacked him.
Some Republicans have attacked the agency as a threat to the nation's moral standards.
Democrats and some Republicans have also attacked the plan as skewed to the rich.
Republicans had attacked that as a form of welfare, providing tax relief to people who paid none.
The Republicans are openly attacking the president in the area of his greatest strength with the public - national security.
If he did not do so, Republicans could attack him in the election campaign as a free-spender.
Republicans will attack it for running up a record deficit of more than $500 billion.
And some Republicans in Congress are attacking the advocacy groups themselves.
"The Republicans will attack the civil justice system," he said.