Mohamed El-Erian on China's recent strong economic data

"They've sprinted out of the Covid-19 shock but the big question is, can they maintain it?" Mohamed El-Erian, economic advisor at Allianz and Gramercy and president at Queens College, Cambridge, told CNBC's "Squawk Box" Tuesday about China's economic recovery. "They've got to reform their economy really quickly if they want to maintain their lead over the rest of the world."