Twitter said Monday that payments to a whistleblower did not breach any of its obligations under the $44 billion acquisition proposed by Elon Musk, after the billionaire sent a third letter to try to call off the deal.

The social media giant said it intends to enforce the agreement and close the transaction on the price and terms agreed upon with Musk, according to a Securities and Exchange Commission filing.

Twitter shareholders will vote Tuesday on whether to approve or reject Musk’s takeover bid.

Twitter’s board of directors has previously urged its shareholders to approve the company’s sale to Musk.