Trump has demonstrated clear anti-Muslim values and racist values. Family members of his have spoken openly about the land value of Gaza and, even before this conflict, made comments about how it would make financial sense to displace Palestinians, annex Gaza and build nice coastal properties. He has a track record of being in supportive of occupation and annexation in the Occupied Territories. There has been no evidence of any shift in his values or behaviour in these or other relevant areas.
The US has a track record of killing and imprisoning large numbers of Muslims. Trust in its internal and external justice processes, military conduct, etc is pretty low - not just among Muslim groups in the US but around the world.
The current administration is losing support from Muslim demographic groups because they (we) see the anti-Muslim biases influencing decision-making, the media and the responses to a humanitarian crisis inflicted upon innocent people. The US has had a decades-long policy of supporting Israel in occupation and oppression of a majority-Muslim population and now they're continuing to facilitate harms against that population, providing huge amounts of lethal weapons despite the growing evidence of these being used to commit war crimes against a majority-Muslim population.
I have friends in the US, across red and blue states, urban and rural areas, from multiple faiths and backgrounds. They are all clear that the US is not safe for Muslim visitors or citizens, that the current administration is facilitating the attacks on innocent people in Palestine, and that Trump will make things worse for Muslims, not better.