Lobo attacked the United Nations building in New York. He was trying to get to the impostor Tseng. Batgirl and Wonder Girl tried to stop Lobo, but he achieved his goal. He exposed Tseng as a Krolotean in a robot suit. He left the building with the Krolotean.
After Captain Atom presented evidence that the Reach were hostile invaders during an emergency session of the UN, and following a unanimous vote, Secretary Tseng rescinded the Reach's invitation to stay on Earth, and demanded they leave.
Following public outcry (lead by G. Gordon Godfrey) over his initial support of the Reach, Tseng Dangun resigned as UN Secretary General.
After Lex Luthor became the new UN Secretary General he started putting restrictions on the Justice League. That they could not enter specific areas without official permission. This caused public opinion to turned against the Justice League, which was part of the Light's plan.