Shadow justice secretary Sadiq Khan said David Cameron took the decision to go on holiday based on the intelligence that he knows.
He said: "He's got the intelligence at his finger tips, he will know what the events of last week, what they involve, with intelligence, he's got people advising him - he's taken the decision to go on holiday and it's a decision that he's got to stand by."
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A colder start to the day with outbreaks of rain expected across Wales and southern England.
A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
The reality star had filed a defamation lawsuit against celebrity gossip site MediaTakeOut.com.