President Joe Biden’s national security adviser warned that the United States could quickly run out of munitions if a war with China broke out.

“God forbid we end up in a full-scale war with the PRC,” Jake Sullivan said on Wednesday at a Center for Strategic and International Studies event, referencing the People’s Republic of China. “But any war with a country like the PRC, a military like the PRC, is going to involve the exhaustion of munition stockpiles very rapidly.”