U.S. President George W. Bush said on Monday that he would continue efforts to isolate Iran because the government in Tehran is "not a force for good" in the world.

"Because of the actions of this government, this country is isolated, and we will continue to work to isolate it because they' re not a force for good as far as we can see, they're a destabilizing influence wherever they are," Bush told reporters after talks with Afghan President Hamid Karzai at Camp David. 

Bush made the remarks after U.S. and Iranian experts held their first meeting in Baghdad's Green Zone on Monday over how to improve bilateral cooperation on the Iraqi security in the war- torn country.

"It is an established channel of communication and we will see in the future as to whether or not it is a useful channel of communication," U.S. State Department spokesman Sean McCormack told reporters in Washington.

Mass media has noticed that what Bush's remarks about Iran are contradict to what Karzai said before the two-day U.S.-Afghanistan summit. 

Karzai told CNN Saturday that he is investigating reports that Iran is fueling violence in Afghanistan by sending in weaponry such as sophisticated roadside bombs.

But he insisted that "Iran has been a supporter of Afghanistan, in the peace process that we have and the fight against terror, and the fight against narcotics in Afghanistan."

The Afghan top leader said that Afghanistan and Iran had "very, very good, very, very close relations. ... We will continue to have good relations with Iran."