SOMERVILLE, N.J. — Gov. Chris Christie on Tuesday defended a settlement with Exxon Mobil on a decade-old lawsuit for a fraction of the nearly $9 billion the state had sought for environmental damage.

The Republican governor said the $225 million settlement is on top of the money the company will have to pay to clean up damage.

“It’s actually a really good settlement,” Christie said at a town hall meeting. “They have to fix everything that they polluted up to state standards and there is no cap on what they have to have to pay.”

He later said the decision to settle was up to the attorney general’s office.