We can ALL believe and agree, as night follows day, that Trump knows Schumer intimately. I mean their families had dinner together or such things. This means that Trump knows what Schumer thinks and feels as an insider.
That was then! now they are political enemies.
When President Trump asserts that Schumer’s tears are fake and phony—95% sure—, then we know it to be true base upon Trump’s knowledge of the man when he knew him as a fellow New Yorker and part of that city’s elite.
Did their families go to each others’ homes–including vacation homes—for dinner? I’ll bet yes.