The federal government's debt undertaking for 1Malaysia Development Bhd (1MDB) will total at t least RM20 billion, PKR's Pandan MP Rafizi Ramli claimed today.

Besides the RM 5.8 billion explicit guarantee that the government has admitted, Rafizi said, it also issued a letter of support undertaking RM9.6 billion in bonds raised by 1MDB in 2013.