Special Counsel Robert Mueller’s team is reaching back more than a decade in its investigation of Paul Manafort, a sign of the pressure Mueller is placing on President Donald Trump’s former campaign chairman.

The FBI’s warrant for a July search of Manafort’s Alexandria, Virginia, home said the investigation centered on possible crimes committed as far back as January 2006, according to a source briefed on the investigation.

The broad time frame is the latest indication that Mueller’s team is going well beyond Russian meddling during the campaign as part of its investigation of Trump campaign associates. Manafort, who has been the subject of an FBI investigation for three years, has emerged as a focal point for Mueller.

The search, an unusually hard-nosed tactic in a probe that centers on possible tax and financial crimes, began before dawn as Manafort and his wife lay in bed, according to sources briefed on the matter.