US officials have declined to speculate on what elements might be included in a joint statement at the end of the meeting.
"Nothing is agreed to until everything is agreed to", one official said.
Bolton has maintained a reserved stance on developments surrounding North Korea's denuclearization.
"Withdrawing is not the subject of the discussion", the official told reporters during a press briefing.
He said the United States would press for a freeze on all weapons of mass destruction and missile programs and a "roadmap" to set expectations for negotiations. The United States keeps some 28,500 troops in South Korea.
Will stop our share of water to Pakistan, says Nitin Gadkari
The Jaish-e-Mohammed l (JeM) terror group, led by Azhar Masood and based out of Pakistan, claimed responsibility for the attack. He said they should also note that where such a provocation will take the two countries and the region.
Wenger, Djokovic emerge winners at 2019 Laureus World Sports Awards
Former Arsenal manager Arsene Wenger received the Laureus Lifetime Achievement Award for his contribution to football. The Serbian bagged the honour for the fourth time having previously won the award in 2012, 2015 and 2016.
Jussie Smollett: police declare Empire actor suspect in his own alleged attack
The actor also did not have a valid driver license and provided false information to law enforcement, according to WFLD-TV . Several reports, citing unnamed sources, suggested police are investigating whether he helped set-up his own attack.
A withdrawal of U.S. troops from South Korea is not under consideration ahead of Trump's summit next week with Kim, a senior administration official says.
The officials noted that punishing USA sanctions would remain in place to give North Korea an incentive to move.
Senior US officials are in Hanoi now negotiating with a North Korean delegation ahead of the summit.
Kim Hyok-chol, the DPRK's special representative for USA affairs of the State Affairs Commission, is expected to visit the Vietnamese capital and meet with his American counterpart, Stephen Biegun.
As North Korea promotes Kim through state-sanctioned events, it is also attacking a recent decision in Seoul to pay more for USA forces on the peninsula.