Portland’s mayor is meeting with immigrant business owners to discuss the role that immigrants play in the city’s economy. Michael Brennan and Portland’s economic development director are visiting businesses on Thursday, two days after the U.S. Senate Judiciary Committee approved a far-reaching bill to remake the nation’s immigration system. The Maine People’s Alliance says Brennan’s tour will begin with a ride in a taxi owned by a Burundi man to a grocery store/export business owned by men from Sudan and Nigeria. The tour ends at a restaurant owned by brothers from Iraq. Brennan will listen to the business owners and others give their thoughts on immigration reform and other issues.