The cardinal who said 'until America goes into political decline, there won't be an American pope' died in 2015 (i.e. before Trump's first term)

The bishop who quoted them does hold the post you mention - but they didn't originate the quote, they just quoted it.

Bishop Barron is pretty middle-of-the-road as far as US Catholic bishops go - he’s not much of a progressive, but nor is he a traditionalist or hardline conservative. On most issues on which Pope Francis and President Trump disagreed, Barron’s views and instincts are closer to the late Pope (who made him a bishop and then gave him a diocese) than to Trump’s