Chris Huhne and his former wife Vicky Pryce were both charged last year with perverting the course of justice over the allegation, said to relate to a speeding offence in 2003.
Pryce previously pleaded not guilty on the grounds of marital coercion and Huhne today also entered a not guilty plea to the charge.
Former Energy Secretary Huhne, 58, from Dutton Lane, Eastleigh, Hants, stood down from the Cabinet following the charge last year, but remained the Lib Dem MP for Eastleigh.
More top news
Some holidaymakers in Tunisia are determined not to be beaten, but it's not goign to be easy to escape the horror of Friday's massacre.
Drink lots of water, stay out of the sun during the middle of the day, and take particular care of vulnerable people.
The 81-year-old has disappeared from his home on the Spanish island on the hottest day of the year so far.