Watch: Stephen Colbert slams ‘D-bag’ Donald Trump for Khizr Khan response

"Late Show" host Stephen Colbert is asking a question the Republican Party has been asking for the last week: What the F, Donald Trump?

On Monday's show, Colbert reprised "The Werd" to examine what Trump was possibly thinking, though he clarifies in the beginning that "F" means family. This weekend, that family belonged to Capt. Humayun Khan, who Trump attacked mercilessly after they spoke at the Democratic National Convention before Hillary Clinton. Even Republicans are walking away from Trump and Mike Pence was left to clean it up. Trump's campaign later begged the GOP for help.

Trump told ABC News that he has “sacrificed” along with the Khans — who lost their son in the Iraq War — by citing his businesses, investments and "tremendous success."

"Yes, Trump has sacrificed a lot. First, humility," Colbert said, before "Second: Humanity" popped up on the screen.

Trump not only alluded to the fact that he's somehow sacrificed more, he attacked Khan's mother Ghazala because she didn't say a word at the DNC. He tried to imply that somehow she wasn't allowed to because she's Muslim. The reality is she is still so filled with grief, she couldn't speak. If that isn't enough, Trump's surrogates tried to align the family with the Muslim Brotherhood.

“Yes, Trump knows a good husband allows his wife to say something,” Colbert said, as "The Werd" next to him read: "That Michelle Obama already said."

“Now, an ordinary candidate, when faced with near-universal condemnation, would stop there,” Colbert continued. One would think. Instead, Trump took to Twitter to go after the dad again, claiming Khan “does not know me,” and shouldn't criticize him.

“How could you possibly judge a presidential candidate unless you’ve met them?” Colbert asked. “Well, I’ve met Donald Trump. So I am on solid ground when I say, Donald, you’re being a dad-bag, which again, due to space, we’ve had to shorten.”

The screen next to Colbert simply read: “D-Bag.”

Colbert explained Trump's strategy as saying something that gets him into trouble and somehow being able to throw people off by saying even worse things that get him into more trouble. "It's worked until now," Colbert claimed. "Trump's made us forget about the crazy statements by saying something even crazier," he said, as "Best offense is good offensiveness" appeared on the screen.

He walked through the series of "worst thing," from calling Mexican immigrants murders and rapists, which he tried to cover up by attacking John McCain for being captured as a prisoner of war. "McCain = POW — Trump = P.O.S." then appeared on the screen. Just when we were starting to forget McCain, Trump turned to attack Megyn Kelly for having "blood coming out of her...wherever." He outdid that by saying we should ban Muslims from coming into the United States.

"Then he made us forget that by talking about the size of his penis," Colbert recalled. "Which seemed shocking until he implied Ted Cruz's father had helped killed JFK."

It seemed too much for Colbert to continue. "The next terrible thing always seems to fix the previous terrible thing. It's like the old woman who swallowed a fly, only Trump would never be seen with an old woman."

It reminded Colbert of a Winston Churchill quote, "Those who fail to learn from history are doomed to — Trump said what?!"

"Trump is going to have to say something really outrageous to make us forget these things he's said about the parents of a fallen soldier," Colbert determined. "But if he succeeds at making us forget I think he'll get to say the craziest thing I can imagine," Colbert continued, as "I, Donald Trump, do solemnly swear..." appeared on the screen.

Check out the video below and also take a look at how Trump gave Colbert whiplash as he was caught in his lies about Russian president Vladimir Putin:

"The Werd"

"Whiplash"