DA leader, Mmusi Maimane, has moved to impeach president Jacob Zuma.
This relates to the saga around Sudanese president, Omar Al Bashir.
In a statement on Tuesday, Maimane said the "Democratic Alliance (DA) believes in the supremacy of the Constitution and respect for the Rule of Law as the bedrock of our democratic state."
He said these principles were "directly contravened by the Executive, under the leadership of President Jacob Zuma, when they facilitated the escape of Sudanese President Omar Al Bashir from South Africa on 15 June. The DA has thus given notice in the National Assembly (NA) today of a motion of impeachment against President Jacob Zuma."
Maimane said the DA will move to have the motion debated in the House on 18 August, whereupon a vote by a third of the House will be required to establish an ad hoc committee to investigate the impeachment charge.
"The events that led to the escape of Al Bashir represent a clear violation of the President's oath to "obey, observe, uphold and maintain the Constitution and all other law of the Republic," and serve as nothing less than grounds for his removal from office in terms of section 89(1)(a) of the Constitution," he said.
"Al Bashir is wanted by the International Criminal Court (ICC), under two warrants issued in 2009 and 2010 respectively, for war crimes, crimes against humanity and genocide. As a signatory to the Rome Statute that established the ICC, enacted into domestic law through the Implementation of the Rome Statute of the International Criminal Court Act of 2002, the South African government had a legal obligation under both international and domestic law to arrest Al Bashir."
The DA leader said "in blatant disregard of their legal obligations, however, Cabinet granted Al Bashir immunity while attending the summit of the African Union (AU) in June, and subsequently allowed him to escape the country. President Zuma, as the head of the Cabinet, bears ultimate responsibility for this decision."
"The decision to allow Al Bashir to escape was also made in contravention the two High Court orders. On 15 June the North Gauteng High Court found that the failure to arrest Al Bashir was inconsistent with the Constitution of the Republic and that he should not have been allowed to leave. By ignoring these rulings, the Executive undermined the independence and authority of the Judiciary as a separate branch of the State in terms of section 165 of the Constitution," Maimane added.