Wajid Khan has jumped the Liberal Ship and the thing to do will be to handle the fallout.
Khan is a mistake made in 2006, by a divided, leaderless Liberal party thinking the Tories were actually interested in bi-partisanship, and that certain issues were above politics. They should never have let him "advise" the Tories on any issue of importance. Chalk it up to experience and move on. Send Mr. Khan into political retirement, like Emerson. Make sure he quits before running in the next election, or crush him in the next election.