Transcript for Trump calls Prime Minister Justin Trudeau ‘two-faced’
And president trump, meanwhile, returning to the white house tonight, lashing out at the inquiry and returning home from the nato summit where he took aim today at Canadian prime minister Justin Trudeau, after what Trudeau was caught saying on mic about president trump. ABC's chief white house correspondent Jonathan Karl traveling with the president. Reporter: President trump was outside of London, meeting with nato leaders as today's impeachment hearings got under way. Thousands of miles away, but paying close attention to what was happening on capitol hill. But think of it, they get three constitutional lawyers and we get one. What's that all about? It is the most unfair thing that anybody's ever seen. I don't think too many people are going to watch, because it's going to be boring, all right? Reporter: The president was also paying attention to this. A video clip from a reception last night in Buckingham palace where several leaders -- including the British prime minster Boris Johnson, French president Emmanuel macron and Canadian prime minister Justin Trudeau -- can be heard apparently laughing about how president trump threw off their schedule by talking to the press for so long during their meetings. He was late because he did a 40-minute press conference off the top -- Reporter: And Trudeau described the reaction from president trump's advisers when he unexpectedly announced that next year's g7 meeting will be at camp David. You just watched his team's jaws just drop to the floor. Reporter: This morning, Trudeau acknowledged the leaders were talking about president trump. Last night, I made a reference to the fact that there was an unscheduled press conference before my meeting with president trump, and I was happy to take part of it, but it was certainly notable. Reporter: After the video clip went viral, the president was asked about it and took a shot at Trudeau. Have you seen the video of prime minister Trudeau talking about you last night? Well, he's two-faced. And honestly, with Trudeau, he's a nice by, I find him to be a very nice guy. The truth is, the fact is, I called him out on not paying 2% and I guess he's not very happy about it. Reporter: A short while later, president trump was overheard boasting about what he called Trudeau. That was funny when I said the guy's two-faced. All right, so, let's get to Jon Karl, live from London again and we took note today that the president was supposed to hold one final press conference before he left the uk, but that was abruptly canceled? Reporter: It sure caught us by surprise, David. The press conference was on the schedule, the traveling press was there waiting for it to begin. When the president suddenly canceled it and decided to fly back to Washington instead. One factor may be that he had already taken many, many, many questions from the press over the past two days. David? All right, Jon, thank you.
This transcript has been automatically generated and may not be 100% accurate.