In an awkward case of foot-and-mouth on Twitter, a Liberal MP has mistakenly broken ranks and declared the recent Free Trade Agreement with China bad for Australian jobs.

On Thursday evening, Northern Territory MP Natasha Griggs chimed into a Twitter conversation with the Australian Council of Trade Unions and the Maritime Union of Australia, much to their delight.

Northern Territory MP Natasha Griggs made an interesting comment on Twitter on Thursday night.

"The FTA does enable cheap Chinese workers as being claimed by unions" she wrote in a tweet which has since been deleted.

Presumably a typing error of some sort, the tweet was immediately seized by the social media accounts of unions, who declared she should now take her new cause up with the Prime Minister.