The tweet comes after contentious talks between North Korean officials and Secretary of State Mike Pompeo, the first high-level meeting since Trump and Kim's summit in Singapore.
Kardashian West visited the White House last week to advocate for Johnson.
Secretary of State Mike Pompeo has been meeting with a delegation from the communist dictatorship.
In a series of tweets citing Republican Rep. Trey Gowdy, Trump unleashed yet another attack on Sessions.
"The United States continues to actively prepare for President Trump's expected summit with leader Kim in Singapore," White House press secretary Sarah Huckabee Sanders said.
The Treasury Department had assembled sanctions that would take aim at about three-dozen targets, including Russian and Chinese entities, The Wall Street Journal reported.
Trump had been holding off on his natural instincts when it came to China, but that will likely change now, sources tell CNBC.
"Sadly, based on the tremendous anger and open hostility displayed in your most recent statement, I feel it is inappropriate, at this time, to have this long-planned meeting," Trump writes to Kim.
A meeting scheduled between GOP lawmakers and DoJ officials will include negotiations over how much sensitive information will be revealed regarding a confidential informant who reportedly spoke to members of the Trump campaign, a source tells CNBC.
Trump made the remark as he met South Korea's president at the White House.