It has been speculated that the Trump administration would agree to end the Korean War and it appears that is the direction Trump-Kim II Summit negotiations are going:
President Moon Jae-in and Chinese President Xi Jinping may join the summit to be held between U.S. President Donald Trump and North Korean leader Kim Jong-un this month in Vietnam to declare an end to the Korean War.
Korea Times
As U.S. Special Representative for North Korea Stephen Biegun stated last week, President Trump is open to formally ending the war as part of measures to spur denuclearization talks with North Korea. This is an idea Moon, Xi and Kim have all been supporting.
One major obstacle was North Korea’s opposition to the continued presence of U.S. troops in South Korea. However, the North has reportedly changed its stance on this.
U.S. and South Korean officials said ending the Korean War is a major topic in the ongoing pre-summit talks in Pyongyang.
You can read more a the link, but I have said this repeatedly, North Korea does not have to call for a withdrawal of US troops when its surrogates in South Korea will do it for them.
Anti-US leftist groups will claim that a peace treaty calls into question why US troops are needed in Korea. Two of the largest anti-US leftist groups, People’s Solidarity for Participatory Democracy and Minbyun-Lawyers for a Democratic Society are already advancing this idea.
The PSPD and Minbyun are both extreme left wing pro-Pyongyang organization that have long been anti-US. For example PSPD is one of the groups behind the ongoing THAAD protests, blamed the US for Christian missionaries kidnapped by the Taliban, was a member of the Korean Alliance Against the Korea-U.S. FTA that even had one of their own set himself on fire outside one of the FTA meetings in Seoul. PSPD was also one of the lead organizations against the relocation of US forces to Camp Humphreys.
Minbyun on the other hand, have been used to legally attack North Korean defectors, one of the groups behind the US beef riots, and have long attacked the USFK relocation plan.
I would not be surprised that these groups and other large anti-US leftist groups eventually mobilize to protest and blockade US military bases to disrupt operations and make life miserable for US servicemembers in Korea. The THAAD site is already experiencing this.
If the traffic at Camp Humphreys is already bad can you imagine what would happen if people had to deal with protesters as well while trying to get through the gates?
The protests combined with the ROK government playing hardball on USFK cost sharing would be intended to convince President Trump to withdraw some if not all of the US troops. This is why North Korea doesn’t have to call for US troop withdrawals when they have surrogates to do it for them.
