Cape Town. The leader of South Africa’s second biggest party said Friday it will back Cyril Ramaphosa for president, almost guaranteeing he will be reelected in Parliament for a second term.

Democratic Alliance leader John Steenhuisen said his party had now formally signed a coalition agreement with Ramaphosa’s African National Congress, and part of the agreement is Ramaphosa will be president.

Lawmakers are due to elect a president later on Friday and the ANC and DA together have a majority of lawmakers that would see Ramaphosa return for a second term. If Ramaphosa is the only candidate nominated, he would be elected automatically without the need for a vote.

Steenhuisen said the DA was now preparing to co-govern Africa's most industrialized economy alongside the ANC and the coalition deal was in place.

Ramaphosa's African National Congress party has been weakened after losing its long-held majority in an election last month, leaving him needing the support of other parties if he is to return as president.

The DA -- once the ANC's biggest political foe -- will now support Ramaphosa and continue the ANC's three-decade hold on the presidency.

The ANC announced late Thursday that it had a coalition agreement in principle with the DA and other smaller parties. ANC Secretary-General Fikile Mbalula said the final details of the agreement were still being worked out. The DA, the second largest party in Parliament behind the ANC with a potentially decisive number of lawmakers, said talks on the details had continued through the night and into early Friday, just before Parliament convened at 10 a.m.

The final deal was signed during a break in the Parliamentary sitting, South African media reported. Two other smaller parties will also be part of the governing coalition.

The 71-year-old Ramaphosa will be reelected automatically if no other candidates are nominated for president. No one else has so far been put forward, though lawmakers can nominate a candidate during Friday's Parliament session, the first since the landmark May 29 national election. Ramaphosa smiled and shook hands with members of his party as he arrived before taking his seat.

The sitting was being overseen by the chief justice and Parliament first swore in hundreds of lawmakers for a new term before it could elect a speaker, a deputy speaker and then the president. It was likely to take hours. The 400-seat lower house of Parliament, called the National Assembly, will vote by secret ballot for all those positions if more than one candidate is nominated. A majority of votes cast is required.

The ANC had faced a deadline to cobble together a coalition agreement of some sort given Parliament must sit for the first time and vote for the president within 14 days of the election results being declared.

South Africa had not faced this level of political uncertainty since the ANC swept to power in the first all-race election in 1994 that ended nearly a half-century of racial segregation.

The party had held a clear majority in Parliament since then, meaning parliamentary votes for the president were formalities and every South African leader since has been from the ANC, starting with Nelson Mandela. Last month’s national election changed that as the ANC’s share of the vote slumped to 40 percent. The DA won the second largest share of the vote with 21 percent, making it a key party in the coalition talks.