Ukraine
"I will never accept any decisions between the United States and Russia about Ukraine, never,” he told NBC's Meet the Press.
For the first time, the PM has made it explicitly clear he's willing to deploy UK troops to the war-torn country.
Maybe appointing a defence policy novice as defense secretary was a bad idea.
The US president has brought Vladimir Putin back onto the world stage.
The BBC presenter said: "Everything is on the table, but you're not there!"
It comes amid fears Donald Trump and Vladimir Putin will hold peace talks without Europe.
The US's proposed terms to end the war are “indistinguishable to Putin’s demands” right now.
The Trump administration is offering mixed signals over its position on the Ukraine war.
"So we wouldn't give away any of Britain, but it's OK for us to give away a bit of Ukraine?"
The US president has said he cannot see Kyiv joining the defence alliance.