-LRB- CNN -RRB- -- The city councils in two of Arizona 's largest cities have voted to file suit over the state 's controversial new immigration law , which allows police to ask anyone for proof of legal U.S. residency . The Tucson City Council voted 5-1 to file suit , and the city council in Flagstaff approved a similar measure 7-0 . Both votes occurred Tuesday . Members of the Phoenix Suns basketball team , meanwhile , plan to wear jerseys that say `` Los Suns '' in a playoff game Wednesday as `` a way for our team and our organization to honor our Latino community , '' managing partner Robert Sarver said in a statement . Opposition to the law continued Wednesday , with some civil rights and labor organizations saying they will announce a boycott Thursday . Joining in Thursday 's announcement will be the National Council of La Raza , which bills itself as the largest national Hispanic civil rights and advocacy organization in the United States ; the Asian American Justice Center ; the Center for Community Change ; the Service Employees International Union ; and the United Food and Commercial Workers , the groups said in a release . Arizona Gov. Jan Brewer signed the immigration measure April 23 . It is scheduled to go into effect this summer . Critics say the law will lead to racial profiling . Brewer and others who support the law say it does not involve racial profiling or any other illegal acts . The city councils said they passed the measures because of concerns over enforcement costs and negative effects on Arizona 's tourism industry . Opponents of the immigration law have called for a boycott of Arizona tourism and urge that no one engage in any commerce with businesses located in the state . In Tucson , council member Regina Romero introduced a motion for `` the city attorney to bring a legal challenge '' because the immigration bill is `` a bad law , which could cost the city millions of dollars in lawsuits and is unconstitutional . '' `` This bill opens the door to racial profiling , and it puts Latinos in Arizona in automatic suspect mode , '' Romero said . Tucson Mayor Bob Walkup said up to 38 percent of retail sales in the city come from legal Mexican visitors . The state immigration law threatens those businesses , Walkup said , just when `` the city is just beginning to recover from the economic downturn . '' The Mexican government issued an advisory to its citizens last week to avoid travel in Arizona . The Organization of American States expressed its concern about the law last week , and presidents of South American countries meeting in Argentina for a gathering of the Union of South American Nations condemned the law Tuesday . Well-known Mexican writer Carlos Fuentes recommended this week that dark-skinned people , men with mustaches , women who use shawls , or anyone who does not speak English well should not go to Arizona because the state has `` officially declared itself racist , '' the government-run Notimex news service reported Wednesday . The Phoenix Suns basketball team also criticized the new law . `` The frustration with the federal government 's failure to deal with the issue of illegal immigration resulted in passage of a flawed state law , '' managing partner Sarver said . `` However intended , the result of passing this law is that our basic principles of equal rights and protection under the law are being called into question , and Arizona 's already struggling economy will suffer even further setbacks at a time when the state can ill-afford them . ''