When discussing the budget slashing proposals from the Trump administration, it is quite likely that President Trump himself has not even read the budget specifics for the various transportation department items, let alone has had said anything to his staff about funding the Amtrak LD routes. That is, if Trump is even aware of Amtrak's long distance trains. It has become quite clear that Trump is not a details guy at all. Not even close. So let's not talk about the budget cut proposals as something Trump himself is involved in. The decisions on what is in the Administrations proposed budgets are being made by the staffers, the ideologues who have landed positions in the White House and agency heads. I suggest we stick to referring to the proposed budget as coming from the "Trump Administration" and not Trump himself in any way.President Trump thinks like a businessman and not a politician. He will most likely push for cuts to those routes loosing money. Same goes for other federal programs loosing too much money. He said he's going to drain the swamp and that includes spending. Elections have consequences but remember that Congress has to approve the budget and allot can happen before it is finalized.
Besides the appropriations funding amounts from Congress, what will matter to Amtrak is who fills the key positions in the Department of Transportation, like the head of the FRA. If those positions get filled by anti-passenger rail and anti-transit advocates, they could make for a challenging 4 years for Amtrak and the major city transit agencies.