foot in both camps, have a - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Support or have good relations with two opposing sides. For example, He had a foot in both camps, making donations to candidates in both parties. In this expression camp alludes to encampments of enemy troops in a battle. [First half of 1900s]