Opposition calls for inquiry on 457 visas The federal opposition wants a parliamentary inquiry into the government's proposed crackdown on the temporary skilled migrant visa program. The government's changes are due to be debated in parliament's lower house later on Tuesday. But coalition immigration spokesman Scott Morrison says the government has not properly consulted with industry on the changes or provided a regulatory impact statement. "They are looking to ram through what is nothing less than an attack on skilled migrants," he told reporters. The coalition will not be supporting the legislation. Mr Morrison said Labor was doing the bidding of the unions. Immigration Minister Brendan O'Connor has come under fire for claiming there is widespread rorting of the visa scheme - a claim employers reject as baseless. Labor's changes will require bosses to make every effort to employ Australians before resorting to foreign workers. The employment watchdog will be given increased powers to monitor the visa scheme, with a 10-fold increase in the number of compliance inspectors. Mr O'Connor insisted the government had evidence the scheme was being rorted and that unemployed Australians and young people graduating with skills were missing out on jobs. "I'm a little tired of being told we don't have evidence," he told ABC Radio, adding there had been a spike in 457 visas. The problem is the group think amongst journalists is quite remarkable in this area.