Political adviser Roger Stone has a hefty amount of complex evidence stacked against him, according to a court filing by the special counsel investigation.

The special counsel investigation, headed by former FBI Director Robert Mueller, began back in May 2017. Stone caught the attention of federal investigators since he had previously served as a political adviser for Donald Trump before he was elected president.

Stone was arrested last week in Fort Lauderdale, Florida. The special counsel team claimed it has a great deal of evidence against him.

“Upon the entry of a protective order, the government intends to begin providing defense counsel with discovery,” stated the court filing by the special counsel, which was obtained by Axios.

“This discovery in both voluminous and complex. It is composed of multiple hard drives containing several terabytes of information.”

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The court filing went into detail: The evidence consists of FBI case reports, search warrants, and bank and financial records. The group also has the contents of numerous physical devices, including cellphones, computers and hard drives, along with communications from iCloud accounts, email accounts, and physical devices spanning several years.

Stone and others have been quick to denounce the way in which a law enforcement team decided to arrest him.

Law enforcement professionals in full tactical gear raided his home early in the morning. He argued they stormed his house in an unnecessarily aggressive show of force that terrorized his wife and his dogs.

Soon after, he denied the charges against him when pleading not guilty the following week.

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Stone was accused in the indictment last week of working to obstructing congressional investigators by making false statements, denying he had records they sought, and persuading a witness to provide false testimony.

Related: DOJ Sued for Allegedly Ignoring FOIA Request About Mueller’s Security Costs

The Mueller team is looking into possible crimes committed by the president or his associates, with a particular focus on whether they colluded or not with Russian interests during the presidential election of 2016.

The special counsel has taken down a handful of former associates of the president since launching its investigation in May 2017.

But it has yet to connect the president himself directly to any collusion allegations.

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