President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Tuesday officially nominated longtime labor lawyer Eugene Scalia to be secretary of Labor.

Trump said back in July that he planned to tap Scalia, who is the son of late Supreme Court Justice Antonin Scalia, for the post days after Alexander Acosta Alex Alexander AcostaFederal litigator files complaint alleging Labor secretary abused his authority Appeals court to review legality of Epstein plea deal Appeals court finds prosecutors' secret plea agreement with Epstein didn't break law MORE resigned as Labor secretary.

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Scalia served as the top legal officer at the Department of Labor during the George W. Bush administration and previously was a special assistant to Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE during his first stint as the top law enforcement officer under the George H.W. Bush administration.

Scalia, currently a partner at law firm Gibson, Dunn & Crutcher LLP, has a career history of representing businesses and fighting to roll back labor regulations. One of his more prominent cases involved representing Walmart as the retail giant fought a Maryland law on employee health care.

His appointment has triggered opposition from labor unions because of his work for businesses in labor fights. Many Democrats are also likely to oppose his nomination, though the Republican majority in the Senate means his confirmation is likely, barring tremendous controversy during the process.

The White House on Tuesday described Scalia as "a renowned labor, employment, and regulatory lawyer," pointing to his private and federal government experience.

Scalia will face a confirmation hearing before the Senate Health, Education, Labor and Pensions Committee sometime after lawmakers in the upper chamber return to Washington following the summer recess.

The committee will need to vote on approving him before his nomination reaches the Senate floor for a full vote, meaning it will be at least weeks before he takes over at the department, provided the vote advances him there.

Acosta resigned under pressure on July 12 over his handling of the first sex crimes case involving Jeffrey Epstein when he was a federal prosecutor in Florida. Epstein, who was indicted on federal sex trafficking charges earlier this year, took his own life in his Manhattan jail cell earlier this month.