Shadow foreign secretary Dame Priti Patel has called on the UK government to offer repatriation flights to British nationals who want to leave Israel.
Dame Priti told the BBC there are "thousands upon thousands" of Britons in Israel, adding that the government's response so far is "not sufficient".
British nationals in the country are facing difficulties getting to the UK, with the airspace closed due to Israel's conflict with Iran. The BBC has contacted the Foreign Office for comment.
Asked if she would offer the US military support if it attacked Iran, Dame Priti said she would not speculate but she would support necessary action if required to defend the UK and its citizens.
It comes as Foreign Secretary David Lammy is set to meet his US counterpart in Washington after Donald Trump said he was mulling whether to join Israeli strikes against Iran.
