This is so amazingly stupid. Donald Trump, Jr. is pretending he actually has a clue and a case by claiming President Obama "stole" a line out of his RNC speech. He's all over being a whiny baby about it, but he's just flat wrong.

I'm honored that POTUS would plagiarize a line from my speech last week. Where's the outrage? #DemsInPhilly https://t.co/sFQ7fblpLh

— Donald Trump Jr. (@DonaldJTrumpJr) July 28, 2016

Only, he's wrong, of course.

Obama said at one point in his speech on Wednesday night, "That is not the America I know." And Donald Trump Jr. used that exact same line just a week prior — albeit with a contraction: "We will not accept the current state of our country because it's too hard to change. That's not the America I know."

Now if you're like me, and you pay special attention to all the speeches President Obama gives and not just the ones in election years, you know he's said that many, many times, and it didn't take people long to correct the younger Trump.

@DonaldJTrumpJr @politico "that's not the America I know" GWB 9/17/2001 -- at a mosque. On tolerance of Muslims

— Ruth Marcus (@RuthMarcus) July 28, 2016

@DonaldJTrumpJr @politico if pouts plagiarized that line from you, then you plagiarized from George W Bush and Hillary Clinton. Google it!

— Ruth Marcus (@RuthMarcus) July 28, 2016

If you want to go back farther than that, you'll find it in the text of Walter Cronkite's remarks, too, via the Washington Post article linked above:

From Walter Cronkite, in fact. Cronkite said it in 1998 in an interview with CNN's Wolf Blitzer: "This is some kind of a resurgent Puritanism that suggests that we all should live by someone else's moral standards. That shouldn't be. That's not the America that I know and love."