Infringement of American sovereignty

In a speech on March 30, 2008 in San Francisco's Unitarian Universalist church, Ellsberg observed that House Speaker Nancy Pelosi doesn't really have the authority to declare impeachment "off the table". The oath of office taken by members of congress requires them to "defend the Constitution of the United States against all enemies, foreign and domestic". He also argued that under the US Constitution, treaties, including the United Nations Charter, become the supreme law of the land that neither the states, the president, nor the congress have the power to break. For example, if the Congress votes to authorize an unprovoked attack on a sovereign nation, that authorization wouldn't make the attack legal. A president citing the authorization as just cause could be prosecuted in the International Criminal Court for war crimes, and it is the duty of congress to impeach the offending president regardless of any agreements that may have been made.//
****Inadvertently, a far-Left figure makes the point that the Copenhagen Conference presents a great risk of infringement of American sovereignty. If the President signs a treaty, that is ratified by 2/3 of the Senate ( now safely in Democratic hands ), the U.S. is bound by the terms of that treaty and cannot abrogate it unilaterally without the approval of the other parties. In the case of Copenhagen, what has been proposed are oppressive strictures on U.S. use of energy AND enormous payments to other countries ( ostensibly for the past generation of CO2 and to cushion the impact on third world countries --like China???!!!!.) For a citizen of the world ( rather than the U.S. only ), Obama would like nothing better than to take a step toward "world government" dictating how the U.S. runs its affairs.See The Bricker Amendment, which failed but anticipated this derogation of American sovereignty and attempted to pre-empt it.****