The Republican-led Senate on Thursday confirmed lawyer Eugene Scalia, a son of the late Supreme Court Justice Antonin Scalia, as President Donald Trump’s new labor secretary.

The Senate voted along party lines, 53-44, to approve Scalia’s nomination. Republicans said his background in labor and employment law made him qualified for the post. Democrats said Scalia fought against unions and was the wrong candidate for Cabinet post.

Sen. Lamar Alexander, R-Tenn., chairman of the Senate Health, Education, Labor and Pensions Committee, said he received more than 30 letters of support for Scalia from small-business owners, workers, former career lawyers at the Labor Department, where Scalia once worked, and more.

“It is important for the Department of Labor to create an environment to help employers and employees succeed in today’s rapidly changing workplace,” said Alexander.

Scalia spent the bulk of his career as a partner in the Washington office of the Gibson, Dunn and Crutcher firm, where he rang up a string of victories in court cases on behalf of business interests challenging labor and financial regulations. He also served for a year as the Labor Department’s top lawyer during the George W. Bush administration.

“The president has sent us a corporate lawyer who’s fought over and over to stop workplace protections, to undermine worker safety, to depress worker’s wages over and over and over again,” said Sen. Sherrod Brown, D-Ohio.

The AFL-CIO opposed the nomination, calling Scalia a union-busting lawyer who has eroded labor rights and consumer protections.

Trump’s previous labor secretary, Alexander Acosta, resigned in July after renewed criticism for his handling of a 2008 secret plea deal with billionaire pedophile Jeffrey Epstein. Epstein was found dead last month in his cell at a federal jail in Manhattan after his July arrest on sex trafficking charges.

Deputy Labor Secretary Pat Pizzella has been serving as acting secretary.

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The Associated Press contributed to this article