Getty Friends of Liberal Democrat leader Vince Cable reject calls for him to make way for a successor. Party insiders had expected him to serve as an interim leader for his Deputy leader Jo Swinson. However, Cable's allies believe he has cemented his position as party leader. The upcoming Lewisham East by-election will be a test of his leadership. LONDON — Liberal Democrat leader Sir Vince Cable has rejected calls to make way for a successor, with friends telling Business Insider that he plans to stay in the job for another 20 years. Cable had been widely expected by party insiders to serve as an interim leader, with current deputy Leader, Jo Swinson, the favourite to replace him.See the rest of the story at Business InsiderNOW WATCH: This top economist has a radical plan to change the way Americans voteSee Also:Theresa May's hopes of a quick Brexit trade deal with Trump are 'not going to happen'A Brexit trade deal with Trump would put British farmers under 'severe threat' warns former ambassador to USIreland's abortion referendum could open a huge fault line in Theresa May's fragile governmentDON'T MISS: George Soros' campaign to publish plan for stopping Brexit on anniversary of May's election disaster