Liberia’s new president, Joseph Boakai, was sworn into office Monday after his narrow win in a November election. Boakai, who at age 79 is the country’s oldest sitting head of state, promised to unite and rescue Africa’s oldest republic from its economic woes.

“Partisanship must give way to nationalism,” Boakai told citizens and foreign delegation members who attended his inauguration ceremony in Monrovia, Liberia’s capital. He listed improving adherence to the rule of law, fighting corruption and renewing “the lost hope” of citizens as his priorities.

The ceremony, however, ended abruptly after Boakai, who wore traditional Liberian attire for the occasion, began to show signs of physical distress while speaking. Officials led him away from the podium after he unsuccessfully tried to continue his address.

A spokesperson for Boakai’s political party said the president’s weakness was caused by heat and had nothing to do with his health.

Boakai has dismissed concerns about his age, arguing that it came with a wealth of experience and achievements that would benefit the country.

He won a tight run-off election to defeat Liberia’s youngest-ever president, George Weah. Public goodwill toward soccer legend-turned-politician Weah waned as he neared the end of his first six-year term. Critics accused him of not fulfilling campaign promises to fix Liberia’s ailing economy, stamp out corruption and to ensure justice for victims of the country’s back-to-back civil wars between 1989 and 2003.