IFS director Paul Johnson warned that the £30bn increase in defence spending would need to be funded by tax rises

But Downing Street will not say how the new NATO commitment demanded by Donald Trump will be paid for by the UK taxpayer

The PM will join fellow Nato leaders in The Hague today after signing up to the goal of spending 3.5 per cent of GDP on defence.

Threat of higher burden as Starmer prepares to commit to spending 5pc of GDP on national security

IFS director Paul Johnson warned that the £30bn increase in defence spending would need to be funded by tax rises

Sir Keir Starmer’s U-turn now leaves the government with a choice between raising taxes or cutting spending elsewhere