Media playback is unsupported on your device
4 October 2014 Last updated at 18:35 BST
She said she will seek a judicial review against Mark H Durkan because he took the decision to adopt the planning policy without the agreement of the full Northern Ireland Executive.
Helen Jones reports for BBC Newsline.
Northern Ireland's Enterprise Minister, Arlene Foster, is to challenge the environment minister in court over his approval of the Belfast Metropolitan Area Plan.