Attorney-General George Brandis is facing calls to resign after the government's top legal adviser accused him of misleading Parliament, in a dramatic escalation of a toxic row between the country's two most senior legal officers.

Senator Brandis has come under fire over a contentious move to restrict his ministerial colleagues' ability to seek independent legal advice directly from Solicitor-General Justin Gleeson, SC.

Documents released at a Senate inquiry on Wednesday suggest same-sex marriage laws and a proposal to strip dual nationals involved in terrorism of Australian citizenship were flashpoints in a simmering feud between the two men.

Mr Gleeson, the government's top legal adviser, said in an explosive submission to the inquiry that he had not been consulted about a change requiring all ministers – including the prime minister – to obtain the written approval of Senator Brandis before seeking his advice.