CHICAGO (AP) — A Democrat running for Illinois governor in 2018 is calling for the impeachment of President Donald Trump.

J.B. Pritzker said in a statement Wednesday the House of Representatives should begin impeachment proceedings. He says there are “credible reports” that Trump “obstructed justice in the investigation of the Russian hacking of our democracy.”

READ MORE: Judge Bars Chicago Police Union President John Catanzara From Encouraging Officers To Defy City's Vaccine Mandate

Pritzker was a top supporter of Hillary Clinton, helping raise millions for her unsuccessful campaign against Trump. The Chicago billionaire says calling for impeachment is “not something done lightly” but that it’s necessary.

The White House has denied that Trump asked former FBI Director James Comey to shut down an investigation.

READ MORE: Survivor Of Kenosha Protests Shooting Sues City, Claims Police Enabled Shooter Kyle Rittenhouse

Pritzker is among several Democrats hoping to unseat Republican Gov. Bruce Rauner.

Others include state Sen. Daniel Biss, businessman Chris Kennedy and Chicago Alderman Ameya Pawar.

MORE NEWS: 16-Year-Old Girl Shot And Killed In Lawndale

(TM and © Copyright 2016 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)