In a message to employees, Mr. Sanders said he will step down on July 5. He did not give a reason.
The lawsuit is one of two brought against Mr. Trump accusing him of violating the so-called emoluments clause.
Trial set to begin Sept. 10.
Representative Jerrold Nadler said that Mueller had agreed to testify after the two committees issued subpoenas on Tuesday.
Stephanie Grisham worked directly for Trump after he took office in 2017.
State has no LGBT nondiscrimination laws.
US government has studied the longest oil spill in history - 14 years after the leak began
Just 30 children remained at the facility near El Paso.
Trump said the sanctions would have been imposed regardless of the incident over the drone.
Wild behavior in teenagers trending down.