U.S. voters will head to the polls in just over 24 hours in the most important political contest in 2024’s year of elections, with Republican Donald Trump and Democrat Kamala Harris presenting very different policy agendas regarding relations between the U.S. and the rest of the world.

On Monday, Kishore Mahbubani, distinguished fellow at the National University of Singapore’s Asia Research Institute and veteran Singapore diplomat, suggested that a Democratic victory would be better for geopolitical stability.

“I hope that Kamala Harris wins,” Mahbubani said during a session with Clay Chandler, Fortune executive editor for Asia, at the Insights Forum in Singapore. “The world will be a calmer place.”

Mahbubani spent over 30 years in Singapore’s foreign service, and twice served as the Southeast Asian country’s representative at the United Nations. After stepping down from the foreign service, he served as the dean of the Lee Kuan Yew School of Public Policy at the National University of Singapore between 2004 and 2017.

A second Trump presidency will struggle with managing “the greatest structural changes to our world order in hundreds of years,” the diplomat argued.

“The last thing you want is an erratic leader like Donald Trump coming in,” he said. “Instead of trying to figure out what these massive changes are and adapting to them intelligently, he wants to drive America back to the past and make America great again without making any adjustments.”

Trump has promised to impose a broad 10-20% tariff on all goods entering the U.S. During his current presidential campaign, he's said that he would not defend NATO allies against Russia if he deemed they had not contributed enough defense spending. He has also demanded that the island of Taiwan pay more for U.S. protection.

But 'momentum is with Trump'

Yet Mahubani had a different view when it came to which candidate looked likely to win the election. “Momentum seems to be with [Trump],” he said.

He again warned observers against underestimating the former president. “At the end of the day, Trump is crazy but he’s not mad,” he noted. “To take the massive center of the body politic and move it so much—that takes real skill.”

U.S. polling averages show both Donald Trump and Kamala Harris with nearly equal levels of support heading into Election Day. Prediction markets on the whole give Trump a slightly larger chance to win, with odds narrowing significantly in the past few days. (Fortune previously reported that Polymarket, a major prediction market, was rife with "wash trading," or fake trading meant to give a false impression of high activity.)