"It's not in China's interest to have an unstable North Korea with nuclear weapons right on its border".
President Donald Trump aims to "pressure North Korea into dismantling its nuclear, ballistic missile, and proliferation programs by tightening economic sanctions and pursuing diplomatic measures with our allies and regional partners", the statement read.
We are engaging responsible members of the worldwide community to increase pressure on the DPRK in order to convince the regime to de-escalate and return to the path of dialogue.
"The Administration's decision to hold this top-secret briefing at the White House indicates the seriousness of the threat", he said in a statement.
The latest move comes as tension soars on the Korean Peninsula following a series of missile launches by the North and warnings from the Trump administration that military action was an "option on the table".
"I really don't understand what is the president's game plan to get North Korea to change its calculation", Senator Ben Cardin, the ranking Democrat on the Senate Foreign Relations Committee, told reporters.
North Korea stunned experts by displaying a wide range of new or modified missile types at its April 15 military parade in Pyongyang.
The briefing team was to meet House members in the Capitol later. Harris will testify before a Senate committee on Thursday, while Secretary of State Rex Tillerson will chair a UN Security Council meeting on North Korea in NY on April 28.
Trump has discussed North Korea with United Nations ambassadors, increased USA military presence in the region, and leaned on China to pressure Pyongyang.More news: Ex-heptathlete To Get Beijing Olympic Bronze Upgrade
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Harris said the USA has "a lot of pre-emptive options" that would affect North Korea's "military calculus".
A spokesman for McConnell said Tuesday that Trump himself offered the White House as a venue for the briefing after McConnell requested an administration update on North Korea.
Earlier Admiral Harry Harris, head of US Pacific Command, said the US would be ready "with the best technology" to defeat any missile threat.
The U.S.is sending the Vinson to waters near the Korean Peninsula in a show of force amid concerns about North Korea's nuclear and missile development.
"If it flies it will die, if it's flying against the Carl Vinson strike group".
Some senators planning to attend said they would welcome hearing from the commander in chief directly about North Korea, which analysts believe is preparing for a sixth nuclear test. Harris said the carrier was in the Philippine Sea, within two hours' striking distance of North Korea if need be. North Korea has vowed to strike the United States and its Asian allies at the first sign of any attack on its territory.
Unspecified parts of the THAAD defense system also were installed.
South Korea said in a statement Wednesday that unspecified parts of THAAD were deployed. China, which is urging restraint on all sides, called for the U.S.to halt the maneuvers.
South Korea's trumpeting of progress in setting up the Terminal High-Altitude Area Defence system, or THAAD, came as high-powered United States military vessels converged on the Peninsula. The anti-missile system also has become a campaign issue ahead of South Korea's May 9 presidential election, with frontrunner Moon Jae-in denouncing the expedited deployment while his closest rival Ahn Cheol-soo says it must take place.