Trump granted clemency to Johnson on June 6, a week after the White House meeting. A week later, the president pardoned her.
Tune in to TODAY on Thursday for full interview.
"I love this woman", Kardashian tells Today's Hoda Kotb in the clip, holding Johnson close.
"It became this mission that I just didn't want to give up", Kardashian said in her joint interview with Johnson. "I think I have to live it out for her, for my family, for the supporters".
Johnson agreed with Kardashian West, and said she intends to keep working on the issue of criminal-justice reform and clemency for prisoners serving similar sentences. "It wasn't an instant thing".
Here's What Sanders Had to Say About Reports She's Leaving - Leah Barkoukis
Before her, Sean Spicer held the position for 182 days before leaving. Sanders has served as Trump's press secretary since July 2017. CBS also reported that more departures are expected soon.
The Last of Us Part 2: watch 12 minutes of intense gameplay
Naughty Dog during Sony's PlayStation Experience event in late 2016 announced the follow-up to action-adventure survival horror game The Last of Us .
The Shining sequel: Ewan McGregor to headline movie
Doctor Sleep is set to be directed by Mike Flanagan , making it his second King adaptation after the acclaimed Gerald's Game . According to Variety , he has lingering rage and a drinking problem that dulls his pain as well as his " shining " powers.
Kim visited the White House in May to meet with Jared Kushner, Trump's son-in-law and senior adviser, who is overseeing the administration's push to overhaul the nation's prison system.
"I was like I can't believe we're in the Oval Office".
Kardashian West, a 37-year-old mom of three, said she was in disbelief about her visit to the Oval Office, at the time thinking, "This is insane". "It was overwhelming in the most wonderful way", she described her late May meeting with the president. Flattery. Kardashian began the meeting by making a joke about "The Apprentice", the reality show that catapulted Trump to national fame. She said she'd spend the rest of her life thanking Kardashian West and others who helped her.
"I love this lady", Johnson said as she hugged Kardashian West at Johnson's sister's home in Memphis. She added that Trump, with whom she has clashed politically, "had compassion for her right away; he felt like it was the right thing to do". "That you can have an affect over them for the greater good of other people".
During the interview, Alice also revealed to Hoda that after Kim took on her cause she kept a photo of the 37-year-old and her husband Kanye West in her Bible. "I thought she knew because the news was starting to break and we had to get her on the phone", the reality star explained. "But I enjoy this. This has fulfilled my heart, and so since I feel so fulfilled, why would I stop that?'"