Inside the White House as President Trump prepped his speech before a joint session of Congress

All the details we have about how the speech came together.

There was a stark contrast between his congressional address -- during which he told Americans that the "time for trivial fighting is over" and asked them to "dream big" -- and his inaugural address 40 days earlier -- where he said that "American carnage stops right here" and talked about poverty, crimes, gangs and drugs.

A senior White House adviser said that the same roster of advisers who were involved in helping craft the inaugural speech were also involved in this speech. That said, the senior adviser confirmed to ABC News that while many people weighed in, policy adviser and frequent speechwriter Stephen Miller played a major role in the creation of Tuesday night’s speech.

White House officials say the change in tone is partly Trump realizing what is possible and understanding what he needs to do in order to get things done.

Just a few hours before the speech, Conway told Fox News that "it's a beautiful speech that will be delivered from the heart."

There could also be another untitled adviser who influenced the speech. A number of initiatives that Trump mentioned in his speech -- paid family leave, women's health, and clean air and water -- are close to his eldest daughter Ivanka’s heart.

While what role she may have played in crafting the speech remains unclear, there were two clear instances on Tuesday alone where her public presence her father was notable.

Earlier in the day, she was seen standing directly behind Trump when he signed two bills relating to helping promote women in science and technology fields and another bill relating to female entrepreneurship.

And then during Tuesday's speech, she was seated directly next to Carryn Owens, the widow of Navy SEAL William "Ryan" Owens, who was killed during a raid in Yemen in January.