Mexican President Andres Manuel Lopez Obrador on Wednesday again declined to congratulate Joe Biden for winning the U.S. presidential election, making him stand out increasingly among world leaders who have withheld their recognition.

Speaking shortly after China’s President Xi Jinping congratulated Biden for his victory, Lopez Obrador reiterated that it would be wrong to offer congratulations until the electoral process has been formally concluded.

“We do not agree with offering congratulations in advance,” Lopez Obrador told reporters at a regular government news conference. “What’s the best thing? For us to wait.”