Comcast Corp. has added two top former Capitol Hill antitrust counsels to its lobbying group ahead of a Senate Judiciary Committee hearing next month on the company’s plan to merge with Time Warner Cable.

Seth Bloom, former general counsel to the Senate Antitrust Subcommittee under retired Sen. Herb Kohl, D-Wis., registered as a lobbyist for Comcast this month, according to a Senate lobbying record posted Tuesday. Bloom, who worked for the committee for 13 years, started Bloom Strategic Counsel after Kohl retired at the end of 2012.