Lord Rennard launches legal action against Lib Dems
10 February 2014 Last updated at 15:48 GMT
Lib Dem peer Lord Rennard has written to his party giving it until Thursday to lift his suspension, the BBC understands.
If it fails to do so Lord Rennard is threatening to seek costs from those involved in his suspension, including party president Tim Farron.
The former Lib Dem chief executive was suspended after four female activists accused him of sexual harassment.
Norman Smith reports.