Incoming White House Press Secretary Stephanie Grisham was seen on video shoving a cohort of North Korean officials aside, in a bid to give U.S. reporters access to President Trump's historic meeting with Kim Jong-un.
In the past, only two former U.S. presidents - Jimmy Carter (in June 1994 and in August 2010) and Bill Clinton (in August 2009) - visited North Korea.
During his trip to the border, Trump is accompanied by South Korean President Moon Jae-in.
In late May, Trump met with some family members of Japanese nationals abducted by North Korean agents in the 1970s and 1980s.
The presenter praised Mr Trump, who he said was "far less sentimental about this stuff and maybe I think.more realistic about it".
Her 2020 rival and US Senate colleague Bernie Sanders did not fault Mr Trump for meeting with Mr Kim.
"As President Moon said, this is an historic moment, the fact that we're meeting. we've developed a great relationship and I really think that if you go back two and a half years and look at what was going on prior to my becoming president it was a very very bad situation and a very unsafe situation for South Korea, for North Korea, for the world", he said.
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"I was proud to step over the line", Trump told Kim as they met in on the South Korean side of the truce village of Panmunjom. "So there's no defending it", Carlson admitted, before then defending the president by attempting to compare North Korea's actions to other nations.
"We want to see a denuclearization of the Korean peninsula, a reduction in these missiles".
The North has balked at Trump's insistence that it give up its weapons before it sees relief from crushing global sanctions.
"I'm not a relativist or anything but it's important to be honest about that". I don't think that is bad on its own.
On the DPRK side, the leaders of the DPRK and the United States shook hands again and took a photo opportunity before crossing the MDL back into the South Korean side. "I am okay with it".
Trump told reporters he invited the North Korean leader to the United States, and potentially even to the White House. Although it was unclear what exactly was discussed during that period, Trump later revealed that the pair had agreed to restart diplomatic talks that collapsed during their last summit in February.