In a speech on March 30, 2008 in San Francisco's Unitarian Universalist church, Ellsberg observed that House Speaker Nancy Pelosi does not have the authority to declare impeachment "off the table," as she had done with respect to George W. Bush. 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 pointed out that under Article VI of the U.S. Constitution, treaties, including the United Nations Charter and international labour rights accords that the United States has signed, 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.