Hicks resigned from her role on Wednesday.
After a closed-door interview with White House communications director Hope Hicks, Representative Dennis Heck (D-WA) declared: "We got Bannoned!"
Representative Adam Schiff said House Intelligence Committee Chairman Devin Nunes changed a controversial memo after the panel reviewed it.
In a 165-page transcript of testimony, Simpson discusses Trump's shadowy business dealings.
The panel will be meeting with Steve Bannon and FBI and Justice Department employees.
Bannon has agreed to an interview with the committee, which is investigating Russia's election meddling and links to the Trump campaign.
If Americans heard private testimony in the Russia investigation probe, they would be "very troubled," says Representative Joaquin Castro.
He was one of at least eight people at a controversial June 2016 Trump Tower meeting.
Representative Adam Schiff said Republicans haven't scheduled any witnesses after next week.
The president's son denies boasting about getting golf course funding from Russians.
Republican lawmakers have called for a special counsel to investigate Lynch.
Roger Stone, a longtime Donald Trump confidant, will testify Tuesday about alleged Russian meddling in U.S. politics, but only behind closed doors.
Obama's former national security adviser has explained why she requested the names of Trump aides from intelligence reports.
The Senate and House intelligence committees and the Senate Judiciary Committee are overseeing investigations into Russian meddling in the presidential election.
Brennan has said he doesn't think President Trump "has a full appreciation of Russian capabilities."
The Intelligence Committee chairman's withdrawal doesn't fix the investigation or solve the chamber's deeper problems.