They say if you manage to get the correct frequency and enough power, using electromagnetism you can create self-increasing resonance within the fabric of space.
Think of Tacoma Narrows bridge. With the correct frequency, you can make objects move in ways that seem impossible. Gif related.
Now when you tinker with this enough, you can create something similar to the concept of an einstein-rosen-bridge.
IF someone were to use this information perfectly, you can create a literal "stargate" system. The corresponding gates are linked by having the same frequency.
How you can manage to travel through these without getting hurt is another difficult exercise.
Given his family connections, it would be safe to assume Trump is a member of a group that has mastered this technology.