Donald 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 Jr.'s legal team is bringing on D.C.-based attorney and longtime regulatory attorney Karina Lynch, Fox Business reported on Sunday.

Lynch is joining the team just days ahead of Trump Jr.’s planned Wednesday testimony before the Senate Judiciary Committee investigating Russian interference in last year’s campaign.

She reportedly helped negotiate Trump Jr. a private interview in front of the committee instead of giving public testimony.

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Trump’s lead attorney, Alan Futerfas, confirmed Lynch was brought on board last week, saying she’s “wonderful” and has “a lot of Washington, D.C., experience.”

Trump Jr. and then-campaign chairman Paul Manafort were initially called to publicly testify in front of the Judiciary Committee after revelations they had an undisclosed meeting during the 2016 presidential campaign with Russian lawyer Natalia Veselnitskaya, who had promised compromising information about Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE.

Democrats have slammed the meeting, calling it a smoking gun proving that the Trump campaign colluded with Russia during the 2016 presidential campaign.

Sens. Chuck Grassley Charles (Chuck) Ernest GrassleyGardner signals support for taking up Supreme Court nominee this year Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee McConnell digs in on vow to fill Ginsburg's Supreme Court seat MORE (R-Iowa) and Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.) said in a joint statement that they would not immediately subpoena Trump Jr. or Manafort to testify at the Wednesday hearing.

"Both Donald Trump Jr. and Paul Manafort, through their attorneys, have agreed to negotiate to provide the committee with documents and be interviewed by committee members and staff prior to a public hearing," the lawmakers said.