“The American people deserve all the facts and full transparency. And Congress needs this information to move forward with the very sobering act of drafting articles of impeachment," Underwood wrote, referring to a probe by the House Judiciary Committee that chairman Jerrold Nadler now says is impeachment-related. "Just as importantly, we need the information to understand how our election was influenced by a foreign adversary."

In releasing her statement, Underwood joins a series of local Democrats who have moved to the pro-inquiry position, including Chicagoan Mike Quigley and fellow suburbanite Sean Casten. However, Underwood’s district is considered more vulnerable to a GOP challenge than most, and her race is believed to be the top priority in Illinois for national Republicans. She won last fall by upsetting incumbent Republican Randy Hultgren.

Republicans have not yet settled on an opponent. Among those jostling for the nomination are state Sens. Sue Rezin and Jim Oberweis and state Rep. Allen Skillicorn.