Davos, Jan. 21 -- US President Donald Trump on Wednesday again questioned NATO's commitment to defending the United States, asking whether the transatlantic alliance would "be there for us," during a speech in Davos.

"The problem with NATO is that we'll be there for them 100%," Trump said. "But I'm not sure that they'll be there for us."

Trump has increasingly questioned the alliance's reliability amid his push for ownership of Greenland and objections raised by European allies over the US taking over the Danish territory.

During remarks linked to his drive to acquire Greenland, Trump issued what he described as a choice for NATO members.

"They have a choice," he said. "You can say yes, and we will be very appreciative, or you can say...