Trump is not white. Human skin is never white. Human skin color ranges from beige to black via all shades of brown.
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To see "white" skin as it is, look at a "white" person wearing a white shirt or white socks. Unless you are color blind, you will see that so-called "white" skin is actually beige.
Human skin color varies depending on the color of its pigmentation or melanin. Sun exposure, specifically ultraviolet radiation, determines genetic skin color. Humanity and pre-humanity originated in Africa. From Africa, humans and "pre-humans" (hominids such as Neanderthals and Desinovans) migrated and populated the globe.
Different regions of the planet receive different levels of UV radiation. This UV radiation is stronger along the equator or center line of the planet. It becomes weaker as you move away from the equator.
Human tribes that stayed close to the equator line with skin exposed to the elements developed darker and stronger melanin. This gave them a natural advantage because melanin works as natural sunscreen protecting the skin from UV radiation.
Human tribes that moved away from the equator line with covered skin to protect from the cold, developed lighter or weaker melanin. This gave them a natural advantage because allowing some penetration of UV radiation stimulates production of vitamin D in human skin.
By the way, all other physical traits or features in human groups are also adaptations to environmental factors, with emphasis on UV radiation. For example, hair texture is also strictly correlated to the UV index in the region. Crispy and elevated hair works as a natural mesh or filter protecting the skull against the deadly (skin cancer) effects of excessive UV radiation. Conversely, straight and fallen hair warms up the skull and neck in cold regions, which also happen to be lower in UV radiation due to the tilt of the Earth.
Read more about UV radiation and the UV index. Avoid frying your skin in the sun when the UV index is higher than 3. Whether you were born with beige, brown, or black skin, you are a precious human being. Live well. Enjoy.
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