Ulster Unionists are fundamentally divided over whether to remain in the Stormont executive or enter opposition, the DUP's Arlene Foster has said.
The environment minister resigned from the UUP four years ago before joining Ian Paisley's Democratic Unionists.
Speaking on Radio Ulster's Inside Politics programme, Mrs Foster said the UUP needed to resolve their internal differences.
"There is a fundamental fault line within the Ulster Unionists," she said.
She said it was becoming "clearer and clearer" that the UUP cannot agree as to whether they should be in the government "and making Northern Ireland a magnet and a beacon in the new world" or be in opposition to "fight against those of us who have a mandate to take Northern Ireland forward".
Inside Politics, Radio Ulster, Saturday 1245 GMT.
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