The average age of a British-born lorry driver is 50, according to Logistics UK, and in the first six months of 2020, 12,000 European drivers left the country altogether
The government requires all EU nationals living in Britain before December 31, 2020, to register for a new immigration status managed and verified entirely online.
"Both sides must implement what we agreed on," von der Leyen, European Commission president, said after meeting Johnson alongside Michel, the European Council president.
"There is complete EU unity on this," she said, adding that the deal had been agreed, signed and ratified by both Johnson's government and the bloc.
The G7 is trying to find a coherent response to the growing assertiveness of President Xi Jinping after China's spectacular economic and military rise over the past 40 years.
But unionists say it contravenes the 1998 peace deal and London has said the Protocol is unsustainable in its current form after supplies of everyday goods to Northern Ireland were disrupted.