Can a citizen of the US file a lawsuit against a foreign government because of failure to disclose all information and costs?

Generally, a U.S. citizen cannot file a lawsuit against a foreign government due to sovereign immunity, which protects foreign states from being sued in U.S. courts without their consent. However, exceptions exist under the Foreign Sovereign Immunities Act (FSIA), such as cases involving commercial activities or violations of international law. The specifics of the situation, including the nature of the claims and the actions of the foreign government, would determine if a lawsuit could proceed. Legal advice should be sought for specific circumstances.