The National Rifle Association has picked up another outside lobbying firm just as the U.S. Senate prepares to hold a vote on gun control legislation as early as this week.

Greenberg Traurig is advocating for the NRA’s Institute for Legislative Action on firearms and gun control legislation, according to lobbying registration paperwork the firm filed with Congress on Monday. Michael Williams, a senior director at the firm, is handling the account. He joined Greenberg Traurig in 2001 after more than 11 years as an in-house lobbyist at the NRA.