Dreams involving public figures like Trump, especially in a politically charged environment like Washington, D.C., often reflect your thoughts or feelings about current events or societal issues. Here’s a breakdown of some elements of your dream:

1. Meeting Trump: This could symbolize your desire for recognition or validation. The fact that you got a picture with him while he rejected others might suggest feelings of exclusivity or a longing to stand out in a crowd.
2. American flag ponchos: Wearing something symbolic like an American flag could indicate a sense of patriotism or connection to your identity and values. It might also reflect a desire to be part of something larger than yourself.
3. Secret passage and witnessing a murder: This part of the dream may represent uncovering hidden truths or secrets in your life or society. Witnessing a murder can signify a fear of loss of power or control, or it may highlight anxiety about serious consequences or situations that feel out of your control.
4. Being on the run: This aspect suggests feelings of guilt or anxiety, possibly related to a situation in your waking life where you feel wronged or misunderstood. It could reflect a fear of judgment from others or a sense of being trapped by circumstances.

Overall, this dream seems to revolve around themes of recognition, anxiety, and the complexities of identity in a larger societal context. It may be beneficial to reflect on any current events or personal situations that resonate with these feelings. Consider how these themes may relate to your life and what they might be prompting you to explore or address.