President Bush has imposed new economic sanctions on Sudan aimed at pressing Khartoum to stop violence in its Darfur region.
Speaking at the White House on Tuesday, Mr. Bush said the U.S. has added 31 Sudanese companies to a list of firms that Americans are barred from doing business with.
He also called for a new U.N. Security Council resolution that would expand an arms embargo on Sudan.
The president restated his stance that the situation in Darfur is genocide, and that the world must put an end to it.
Speaking to VOA, a Sudanese Foreign Ministry spokesman, Ali Al Sadiq called the sanctions unjustified, and said they will not solve the problems in Darfur.
China's special envoy on African affairs, Liu Guijin, also criticized the sanctions, saying they will only complicate the Darfur conflict.
The U.S. sanctions extend to three Sudanese individuals Mr. Bush said are responsible for violence in the region. The Treasury Department identified the men as a Darfur rebel leader, Khalil Ibrahim, and two high-ranking Sudanese officials: Military and intelligence chief Awa Ibn Auf, and State Minister for Humanitarian Affairs Ahmad Muhammed Harun.
Harun already faces war crimes charges from the International Criminal Court.
In his address today, President Bush accused Sudanese President Omar al-Bashir of obstructing efforts to bring peace to Darfur and reneging on promises to allow a U.N. peacekeeping force into the region.
He also said Mr. Bashir has taken no steps to disarm government-backed militias accused of atrocities in Darfur. Sudan has denied supporting the Arab "Janjaweed" militias, which witnesses say have burned down villages and killed many civilians.
More than 200-thousand people have been killed in Darfur and more than two million have been displaced since rebels began an uprising in 2003.