Democrats on the House Intelligence Committee are preparing to issue a subpoena as soon as Thursday to obtain phone records linked to the June 2016 Trump Tower meeting between Trump campaign officials and a Russian lawyer, two sources familiar with the matter tell The Hill.

The subpoena will be the first order Rep. Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.) will issue as committee chairman, and the process of preparing the order came one day after the committee became formally constituted.

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Details about the specifics of the subpoena remain unclear, but the order goes to the heart of the committee’s plan to investigate ties between the Trump campaign and Russia.

The Trump Tower meeting in particular has come under scrutiny after Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, the president's son-in-law Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE and then-White House campaign manager Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE met with a Kremlin-linked lawyer during the 2016 election in an effort to obtain dirt on the Clinton campaign.

For months, questions have swirled about who Trump Jr. talked to on a blocked number ahead of the meeting.

CNN reported earlier this month that Senate investigators have learned that Trump Jr.’s phone calls were not made to his father.

Sources told the outlet the Senate Intelligence Committee had received records that Trump Jr. talked to two of his business associates in that phone call.

A spokesperson for the committee declined to comment.

The subpoena will be the first of what is expected to be many as Democrats on the panel scrutinize whether foreign actors have sought to gain leverage or even influence President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE and those in his inner circle, according to the parameters of the probe Schiff laid out Wednesday.