He has no leverage through his MI6 background. This isn't a case where he was involved in an intelligence-gathering operation in some backwater in Africa. He was a key player in a foreign campaign to undermine a presidential election in which the target of his work ended up winning the damn election.
In intelligence parlance, the British government has a huge incentive to treat him like a "kite" and cut him loose.
74 posted on 01/05/2018 2:26:32 PM PST by Alberta's Child
("Tell them to stand!" -- President Trump, 9/23/2017)