Key Facts

• Richard Blumenthal is a Democratic senator from Connecticut.
• Blumenthal called on Howard Lutnick to step down as Commerce secretary.
• The call followed allegations that Lutnick shielded Nvidia from federal oversight.
• The allegations involved Nvidia, a technology company.
• Jensen Huang stepped down from his role as Nvidia’s chief executive on Thursday.
• The account links Huang’s departure to claims that had come to light.