Note how Moody's says directly that Trump's policies will increase government spending (by a lot, I might add). They also's directly state it's Trump's tax policy. Not anything else. Trump is the direct reason the US' credit rating drops. Yet another reason to state the obvious: Republicans, and definitely not Trump, care about the US's debt or low taxes.
This should be no surprise. They've been talking about "balanced budgets", but ever since Clinton actually balanced the budget, they yell about balanced budgets in Democratic presidencies (which reduce the deficits), and then in Republican presidencies they cut taxes without reducing revenue.
Yeah but it's still amazing just how much Trump wants to give to himself and the rich. The "tax cuts" (which aren't tax cuts, they're entirely debt financed, which republicans keep telling me isn't a tax cut) he already did in 2016 were, per year, slightly less than social security + medicaid. If this Moody's report is to be believed the now-planned tax cuts will be more than social security + medicaid.
So Trump wants to TRIPLE social security and medicaid expenses ... with just 2/3 going to him and the rich.