Christian Castro, 52, also faces state charges in the shooting.
Sen. John Cornyn said there were "new complications this morning."
A Hollywood movie producer was arrested this week after federal prosecutors in Illinois charged him with defrauding investors of more than $100 million in an alleged Ponzi scheme.
Lawyers with the DOJ have agreed to unilaterally withdraw a series of subpoenas that sought to compel New York Times journalists to testify about their sources.
The investigation is in part about his finances, sources told ABC News.
A judge has referred President Trump's lawyers for potential disciplinary action for filing the suit against the IRS that led to the creation of Anti-Weaponization Fund.