Senate Judiciary Committee ranking member Dianne Feinstein sent letters to Carter Page, Sam Clovis, Walid Phares and J.D. Gordon.
Special counsel Robert Mueller has announced his first charges, but the investigations by lawmakers are mired in partisan politics.
The apparent meeting came after Flynn's legal team reportedly stopped working with Trump's lawyers.
Senator Chris Coons is calling for a hearing into Dana Boente's abrupt resignation.
Delegates argued at the Constitutional Convention that a president should be impeached if he colluded with "foreign powers."
The long-serving congressman has faced documented sexual misconduct allegations, according to Buzzfeed.
Speaking at a Federalist Society event, he said, "Is Ambassador Kislyak in the room?"
The president's son denies boasting about getting golf course funding from Russians.
The former interim chairwoman of the Democratic National Committee wrote about the unsolved murder of Seth Rich in her new book.
He had faced scrutiny in October for having dropped cases after receiving campaign contributions from lawyers.
The FBI had previously said the bureau began drafting a statement about Clinton months before interviewing her.
The Senate Judiciary Committee had asked Natalia Veselnitskaya for information about her Trump Tower meeting.
Rich's mysterious death was the subject of conspiracy theories.
The assessment, from August, blamed "perceptions of police brutality" for violence against officers.
He will also step down from the hedge fund Renaissance Technologies.
The president used similar language after the Manchester attack in September.
Papadopoulos, a former foreign policy adviser to Trump, has pleaded guilty to lying to federal agents, the special counsel's office announced Monday.
Boente's successor for the Eastern District of Virginia could be asked to fire Mueller if enough Department of Justice people are unavailable.
Republican candidate Ward has the backing of Steve Bannon and Robert Mercer.
An employee directed a staffer to avoid photographing Linda McMahon with a "Trump Hotels" sign, documents show.
The chief of staff had said the congresswoman once claimed to have secured funding for the facility.
Administration lawyers met with the House Committee on Oversight and Government Reform on Wednesday.