Asked if he is "Nigel Farage is disguise", given the Reform UK leader has previously vowed to increase defence spending but cut the foreign aid budget, Sir Keir said: "Nigel Farage didn't even turn up to the debate in parliament today.
Asked by Sky News political editor Beth Rigby if Mr Trump had "bounced" him into setting out a timeline, given he has long called for European countries to boost defence spending, the prime minister said: "I think in our heart of hearts, we've all known that this decision has been coming for three years, since the beginning of the conflict in Ukraine.
However, he denied Mr Trump was effectively setting UK government policy, saying the defence spending increase is "very much my decision" and he has been "arguing for some time" that Europe and the UK "needed to do more".
In a surprise Commons statement on Tuesday morning, Sir Keir said defence spending will increase to 2.5% of GDP by 2027, funded by a cut in the foreign aid budget.
While this honours a Labour manifesto commitment, ministers have previously been tight-lipped about when the new target would be reached - with today's decision coming ahead of a meeting between Sir Keir and Mr Trump in Washington on Thursday.
