Grant Shapps
Grant Shapps also said he is "not aware" of a recent trip to Italy being made by the PM.
People returning to England will have to self-isolate for 14 days.
It comes as new coronavirus rules restricting social gatherings to six people look to put a dampener on the festive season.
The transport secretary made the changes as part of a new regional approach to the self-isolation rules.
UK nations once again impose different measures on holidaymakers returning home.
"It beggars belief that the government are threatening people like this during a pandemic," said the Labour party.
Transport secretary Grant Shapps announced that travellers arriving in England from those countries after 4am on Saturday will need to self-isolate for 14 days.
His comments came after Croatia and Austria were dropped from the UK's list of safe travel corridors.
Transport secretary says holidaymakers returning to the UK after 4am on Saturday must obey the rules.
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