South Africa's ruling party, known as the African National Congress, has controlled the government for some 30 years, but recent polls project it will lose its parliamentary majority in the general election on May 29 due to poverty and corruption issues.
"We also have issues of concern that you cited, particularly some of South Africa's engagement with Russia and China, and we will continue to raise concerns with any new government if they continue to pursue those policies," Phee told the US House Foreign Affairs Committee.
South African voters decide which party will control the country's parliament, and those lawmakers will then choose who will be the president of South Africa.
Dethroning the African National Congress could trigger policy changes to Africa's most advanced economy, according to media reports.