Washington (CNN) House Judiciary Chairman Jerry Nadler on Thursday said the House Judiciary Committee is "going to court" next week in hopes of enforcing a subpoena for White House counsel Don McGahn to testify before Congress.

Appearing on "Anderson Cooper 360," Nadler said securing testimony from McGahn would mark an important step toward launching an impeachment inquiry against President Donald Trump.

"That's why we're going to court tomorrow in the first of a series of actions that we'll take in the next couple of days," he said. "When we've laid out the facts in front of the American people, then we'll proceed."

The special counsel's report, which was released in April, stated that in June 2017 -- after media reports indicated then-special counsel Robert Mueller was investigating whether Trump had obstructed justice -- Trump called McGahn at home and directed him to call the acting attorney general to say Mueller "had conflicts of interest and must be removed." McGahn declined to do so, deciding that he would "rather resign than trigger what he regarded as a potential Saturday Night Massacre."

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