Thousands of opposition protesters have set up tents outside Georgian President Mikheil Saakashvili's office, vowing to hold round-the-clock demonstrations until he resigns.

Opposition leaders say they moved the heart of their protest from in front of the parliament building to outside the president's office so he will hear them better.

They are also blockading Tbilisi's main street, Rustaveli Avenue.

Georgian police are standing by but have made no move to break up the rallies.

The opposition launched their marathon protests last week. It accuses Mr. Saakashvili of becoming more authoritarian and bungling last year's disastrous war with Russia.

President Saakashvili has said he will not step down before his term ends in 2013. He has offered to hold talks with the opposition.

Meanwhile, Georgian Foreign Minister Grigol Vashadze is in Washington for talks Tuesday with Secretary of State Hillary Clinton.

Georgian television says Russia's military presence in two breakaway Georgian republics will be a main topic.

Russian troops moved into South Ossetia last August when Georgian forces tried to retake the region by force. Russian troops are also inside a second breakaway republic, Abkhazia. Russia has recognized both regions as independent countries, further angering the West.

Some information for this report was provided by AFP, AP and Reuters.