White House refuses to hand over documents requested by the House Oversight Committee, calling the request "unprecedented and extraordinarily intrusive."
"I still believe that the average citizen, the guy on my block, they oughta know if the president is making a deal, whether he's making it in his self-interest or that of the country," said House Oversight and Reform Committee Chairman Elijah Cummings.
Rep. Elijah Cummings, a Maryland Democrat, said the Red Hen restaurant should not have kicked out Trump White House Press Secretary Sarah Huckabee Sanders Friday night.
"As representatives of the American taxpayers, we are responsible for ensuring that their hard-earned money is not wasted."
More than 50 members of the Democratic Women's Working Group have called for a congressional investigation into the president's alleged sexual misconduct.
Administration lawyers met with the House Committee on Oversight and Government Reform on Wednesday.
Representative Elijah Cummings wants a review similar to the one the FBI did for Hillary Clinton.
Conway had taken flights with Tom Price, who resigned as Health and Human Services secretary amid reports on the subject.