Presidential Minister Juan Ramon Quintana said he intended to denounce what he called "interference" by the U.S. Embassy in Bolivia and hoped to repair troubled U.S.-Bolivian relations in meetings with U.S. congressmen next week.

Morales has accused the U.S. Agency for International Development, or USAID, of supporting Bolivia's conservative opposition.

His administration points as evidence to a "descentralization" campaign by USAID designed to strengthen Bolivia's historically weak nine state governments — six of which are controlled by opposition governors.

In recent years, U.S.-sponsored programs have trained state employees to better handle budgets, planning and public services so that state governments might "operate more strategically," according to USAID documents.

U.S. Embassy officials insist that aid is evenly distributed across Bolivia, and note that some programs benefit communities led by Morales' Movement Toward Socialism party.

Already delicate U.S.-Bolivian relations were further strained this month by complaints that an embassy official asked Peace Corps volunteers and a Fulbright scholar to collect information on Venezuelans and Cubans working in Bolivia. The two countries, both led by Morales allies, also provide aid to the Andean nation.

Bolivia's U.S. ambassador Gustavo Guzman declined to confirm which U.S. lawmakers Quintana planned to meet in Washington next week, saying his schedule had yet to be determined.

Bolivia received $124 million in U.S. aid in 2007.