WASHINGTON: As the Bush administration speeds ahead with plans to construct a missile defense system in Eastern Europe, some Democrats in Congress want to put on the brakes, saying it has not been adequately tested.

Secretary of State Condoleezza Rice was scheduled to be in Warsaw on Wednesday to sign an agreement on the missiles with Poland, which agreed to the basing of 10 interceptors last week, after the Russian attacks on Georgia. Justified as a defense against a missile attack on Europe by a rogue nation like Iran, the installation has provoked outrage from Russia. ....