The head of the House Judiciary Committee is scheduling a markup of acting Attorney General Matt Whitaker Matthew G WhitakerEx-federal prosecutor: 'Thank God' Whitaker is gone, Barr will bring 'integrity' back to DOJ GOP pollster says Dems are relitigating 2016 election with investigations of Trump Former senior FBI official calls Whitaker hearing ‘disgraceful’ MORE's subpoena ahead of his slated appearance on Capitol Hill, saying the preemptive move is out of an "abundance of caution."

The decision by Rep. Jerrold Nadler (D-N.Y.) signifies the new Democratic majority's aggressiveness to be a check on the Trump administration, particularly by further pressuring top officials to testify before Congress.

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"In an abundance of caution — to ensure that Mr. Whitaker both appears in the hearing room on Friday morning and answers our questions cleanly — I have asked the Committee to authorize me to issue a subpoena to compel his testimony," Nadler said in a statement on Tuesday.

"For the first two years of the Trump Administration, Congress allowed government witnesses to dodge uncomfortable questions. That era is over," he continued.

Nadler noted that the subpoena "will be entirely unnecessary" if Whitaker appears Friday morning as scheduled.

"There need not be surprises here. We have been quite public about our intention to obtain this information from Mr. Whitaker," the New York lawmaker concluded.

The strategic move also calls further public attention to the high-profile hearing in which Whitaker will appear before the House Judiciary Committee on Friday morning.

The top Republican on the panel blasted the move Tuesday, asking when the committee started hitting witnesses with orders who offered to come in voluntarily.

"The majority had enough faith in its witnesses last week not to subpoena them. The key difference today is simply that this witness is part of the Trump Administration—and now we’re setting a dangerous precedent," ranking member Doug Collins Douglas (Doug) Allen CollinsLoeffler paints herself as 'more conservative than Attila the Hun' in new campaign ad Vulnerable GOP incumbents embrace filling Supreme Court seat this year Georgia GOP Senate candidates cite abortion in pushing Ginsburg replacement MORE (R-Ga.) said in a statement. "The message to witnesses here is, if you make the time and effort to appear of your own accord, Democrats are going to subpoena you anyway.”

Lawmakers reached a deal with Whitaker last month in which he agreed to testify regardless of whether the partial government shutdown was still ongoing and regardless of whether he was still the Justice Department's interim top cop.

The Judiciary chairman has also taken other measures to prevent Whitaker from avoiding answering particular questions when he appears before the committee by sending him a series of questions in advance.