Former Gers striker Kris Boyd questioned whether Warburton would stick around if King failed to bring their targets to the club.
Former Light Blues forward Kris Boyd questioned whether Warburton would stay at Ibrox if King failed to secure the signings he wanted during this window after the club missed out on Toumani Diagouraga, while Michael O'Halloran remains with St Johnstone despite Rangers' reported interest (via Record).
But Warburton insisted that the chairman has delivered when he has approached him about going after a target.
The Record reports that when asked if he trusted King, Warburton responded: "Yes, of course. I haven't lost a player I've asked for yet.
"If I had gone for five in the summer, got three, lost two and been arguing about others then I could understand where you are coming from
"But I wanted Foderingham, Kiernan, Tavernier, Waghorn, Halliday and Holt. I got them."
Rangers recently bagged their third signing of the window with Billy King joining the club on loan from Hearts until the end of the season. His arrival follows those of Harry Forrester and Maciej Gostomski, while Matt Crooks and Josh Windass have agreed pre-contract deals (via Evening Times).
And while the Gers may have missed out on Diagouraga, and may have no more success bringing O'Halloran to the club either, the team's commanding position in the Scottish Championship would suggest that they need to do very little else in the market to ensure that they return to the Premiership as champions anyway.