State lawmaker William Tong has won the Democratic nomination for Connecticut attorney general.

The state representative from Stamford was the endorsed candidate in the three-way race. He defeated state Sen. Paul Doyle, who was Tong’s co-chair on the legislature’s Judiciary Committee, and former federal prosecutor Chris Mattei.

Tong is the son of Chinese immigrants and is seeking to become the first Asian-American to hold the office.

He has campaigned on his willingness to challenge in court the policies of President Donald Trump on issues including immigration.

Tong has worked as commercial litigator and was first elected to the state House of Representatives in 2007. He briefly ran for U.S. Senate in 2012 and lost in a Democratic primary in the race for mayor of Stamford in 2013.