There are 3.5 years left in the administration. The time between Apollo 1 and Apollo 11 was 2.5 years. At its closest point, Mars is more than 100 times further away than the Moon. Just a trip there takes like nine months when delivering small payloads that don't need to return. And you need to time it so that you plan the mission when mars and earth are very near each other, which is only every couple of years.

The idea that the Trump administration could put a man on mars before the end of their term, even if this was a very top priority is ludicrous.