An ambitious pledge to cut greenhouse-gas emissions under consideration by the U.S. gives President Joe Biden more leverage when he hosts leaders for a climate change summit later this month — presenting a particular challenge to China’s Xi Jinping.

The White House may commit to emissions cuts of 50% or more from 2005 levels by 2030, Bloomberg reported this week. Officials are looking at opportunities across the federal government on standard-setting, clean energy investments and resilient infrastructure plans, according to people familiar with the deliberations.

It’s uncertain whether the U.S. can actually deliver on such a bold plan, but the indication that Biden is willing to significantly up the ante on emissions targets may put pressure on China, which has already tried to position itself as a leader in reducing greenhouse gases.