Boston Mayor Michelle Wu will run unopposed for in her reelection bid after a challenger didn’t garner enough votes to advance to the general election, the city’s election department announced Monday. She was expected to face Josh Kraft, a nonprofit leader and son of Patriots owner Robert Kraft, but he dropped out after losing badly to her in the preliminary election earlier this month. The last time a mayor ran unopposed in Boston was Mayor Thomas Menino in 1997. Boston is commonly known as a sanctuary city, and Wu has repeatedly said she wants it to be a welcoming place for immigrants. The U.S. Department of Justice filed a lawsuit against Wu, the city of Boston and its police department over its sanctuary city policies, claiming they’re interfering with immigration enforcement.