Donald Trump is delivering what the White House has described as a ‘major speech’ in Warsaw amid a host of questions about America's commitment to its European allies.

Speaking to a large crowd in Krasinski Square ahead of a meeting of G20 nations, the US President will address the “creep of government bureaucracy” and the fight against terrorism.

Mr Trump is also expected to warn that the "fundamental question of our time is whether the West has the will to survive".

Poland and other European allies will be anxiously seeking reassurance of America’s continued commitment to Nato after Mr Trump’s mixed messages throughout this presidential campaign.