President Joe Biden expressed alarm at a “backward slide” of democracy around the globe on Thursday, calling on fellow world leaders to work with him to bolster democratic institutions as his administration grows increasingly concerned about China’s and Russia’s push for global influence. Biden’s comments to more than 100 leaders at the White House’s first virtual Summit for Democracy came as they pointed to a host of challenges confronting democracies, including corruption, inequality, and limitations on press freedom. The leaders also expressed increasing worry about the perils of disinformation and strengthening autocracies.