Eugene Scalia, whom President Trump intends to nominate as labor secretary, is often hired by companies when they are sued by workers, or when they want to push back against new employment laws and regulations.

The U.S. Chamber of Commerce praised him as an “excellent choice,” saying he would be a valuable asset to the department as it finalizes several regulations .

Senators, especially Democrats, are sure to closely study his long career working on behalf of corporate clients, which was interrupted by a brief tenure as the Labor Department’s top lawyer.

Mr. Scalia, who is the son of the deceased Supreme Court justice Antonin Scalia, is perhaps best known for his opposition to a regulation that would have mandated greater protections for workers at risk of repetitive stress injuries. But he played a role in several other prominent cases, representing the financial industry and companies like UPS and SeaWorld. Here are three important issues he worked on.