WASHINGTON - Incoming Senate Foreign Relations Chairman Joseph Biden, a potential Democratic presidential candidate, said Tuesday he would oppose any effort by President Bush to increase U.S troops in Iraq as part of a new war strategy.

Biden also announced he has summoned Secretary of State Condoleezza Rice to testify before his committee next month to discuss the administration's new plan for Iraq as soon as it is made public.

The Delaware Democrat took advantage of a quiet holiday week to draw attention to his own proposal for Iraq, which includes beginning a drawdown of U.S. forces and finding a political settlement among the various ethnic factions there.

Biden has spoken candidly of his desire to run for president and has made repeated visits in the past year to early voting states like Iowa and New Hampshire. But he is trying to find room on a crowded stage of Democratic contenders that includes Sens. Hillary Rodham Clinton of New York and Barack Obama of Illinois.