Seems the red cross is a tad pissed their emblem is being used to give legitacy to the US organised "aid caravan" which they do not support.
Quite right of them, too. They have an international, nonpartisan credibility to maintain. (Personal note: Despite it's problems, I still think highly of the Red Cross. Dad was a POW and Mom a slave during the Big WWII, and both have told me how much of a difference the Red Cross made in their worlds while captive. It gave them a sense of an outside world that still knew and cared about them.)