The DA's attempts to reinstate charges of racketeering and corruption against two senior ANC politicians in KwaZulu-Natal undermines the NPA, the ANC said on Tuesday. "What is worrying about the DA's move is that it forms part of what seems to be a well-calculated attempt by the party to undermine our constitutionally formed government institutions, such as the NPA," spokesman Senzo Mkhize said in a statement.