This is the huge story this morning. It's in the Wall Street Journal but this link gets you past the paywall.
"Two senior European officials cited a European Union-U.S. summit in October in Washington at which Biden struggled to follow the discussions. Both said he stumbled over his talking points at several moments, requiring Secretary of State Antony Blinken to intervene and point out the lines he should use."
DW TV's American correspondent last night was quite certain that Biden will be the Democratic candidate in November, which made me happy. For all his grave faults and the way he left office President Trump offers hope of peace between the USA and China.